[syzbot] INFO: task hung in nfnetlink_rcv_msg (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 08e8a949f684 net: wwan: t7xx: Fix the ACPI memory leak
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=15cc5b2d880000
kernel config: https://syzkaller.appspot.com/x/.config?x=60808f80d41c27e5
dashboard link: https://syzkaller.appspot.com/bug?extid=9204e7399656300bf271
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15569dc5880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1437f803880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/49fbc1a069d4/disk-08e8a949.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0aadd1f9073a/vmlinux-08e8a949.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b75d62dbd582/bzImage-08e8a949.xz

The issue was bisected to:

commit 5f7b51bf09baca8e4f80cbe879536842bafb5f31
Author: Jozsef Kadlecsik <kad...@netfilter.org>
Date: Wed Jul 28 15:01:15 2021 +0000

netfilter: ipset: Limit the maximal range of consecutive elements to add/delete

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15e630e3880000
final oops: https://syzkaller.appspot.com/x/report.txt?x=17e630e3880000
console output: https://syzkaller.appspot.com/x/log.txt?x=13e630e3880000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9204e7...@syzkaller.appspotmail.com
Fixes: 5f7b51bf09ba ("netfilter: ipset: Limit the maximal range of consecutive elements to add/delete")

INFO: task syz-executor291:3680 blocked for more than 143 seconds.
Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor291 state:D stack:27192 pid:3680 ppid:3668 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5191 [inline]
__schedule+0xae9/0x53f0 kernel/sched/core.c:6503
schedule+0xde/0x1b0 kernel/sched/core.c:6579
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6638
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
nfnetlink_rcv+0x1b0/0x420 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2298c5e0e9
RSP: 002b:00007ffc1c6fdb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f2298c5e0e9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 00007ffc1c6fd5b0 R11: 0000000000000246 R12: 000000000007689b
R13: 00007ffc1c6fdb4c R14: 00007ffc1c6fdb60 R15: 00007ffc1c6fdb50
</TASK>
INFO: task syz-executor291:3681 blocked for more than 143 seconds.
Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor291 state:D stack:27952 pid:3681 ppid:3662 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5191 [inline]
__schedule+0xae9/0x53f0 kernel/sched/core.c:6503
schedule+0xde/0x1b0 kernel/sched/core.c:6579
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6638
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
nfnetlink_rcv+0x1b0/0x420 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2298c5e0e9
RSP: 002b:00007ffc1c6fdb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f2298c5e0e9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 00007ffc1c6fd5b0 R11: 0000000000000246 R12: 0000000000076893
R13: 00007ffc1c6fdb4c R14: 00007ffc1c6fdb60 R15: 00007ffc1c6fdb50
</TASK>
INFO: task syz-executor291:3682 blocked for more than 144 seconds.
Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor291 state:D stack:26400 pid:3682 ppid:3663 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5191 [inline]
__schedule+0xae9/0x53f0 kernel/sched/core.c:6503
schedule+0xde/0x1b0 kernel/sched/core.c:6579
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6638
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
nfnetlink_rcv+0x1b0/0x420 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2298c5e0e9
RSP: 002b:00007ffc1c6fdb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f2298c5e0e9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000076898
R13: 00007ffc1c6fdb4c R14: 00007ffc1c6fdb60 R15: 00007ffc1c6fdb50
</TASK>
INFO: task syz-executor291:3684 blocked for more than 144 seconds.
Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor291 state:D stack:27000 pid:3684 ppid:3666 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5191 [inline]
__schedule+0xae9/0x53f0 kernel/sched/core.c:6503
schedule+0xde/0x1b0 kernel/sched/core.c:6579
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6638
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
nfnetlink_rcv+0x1b0/0x420 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2298c5e0e9
RSP: 002b:00007ffc1c6fdb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f2298c5e0e9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000007689e
R13: 00007ffc1c6fdb4c R14: 00007ffc1c6fdb60 R15: 00007ffc1c6fdb50
</TASK>
INFO: task syz-executor291:3685 blocked for more than 144 seconds.
Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor291 state:D stack:27952 pid:3685 ppid:3667 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5191 [inline]
__schedule+0xae9/0x53f0 kernel/sched/core.c:6503
schedule+0xde/0x1b0 kernel/sched/core.c:6579
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6638
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
nfnetlink_rcv+0x1b0/0x420 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2298c5e0e9
RSP: 002b:00007ffc1c6fdb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f2298c5e0e9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 00007ffc1c6fd5b0 R11: 0000000000000246 R12: 0000000000076899
R13: 00007ffc1c6fdb4c R14: 00007ffc1c6fdb60 R15: 00007ffc1c6fdb50
</TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c58f0f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c58edf0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
#0: ffffffff8c58fc40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x57/0x264 kernel/locking/lockdep.c:6494
2 locks held by getty/3309:
#0: ffff88814afa0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
1 lock held by syz-executor291/3680:
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
1 lock held by syz-executor291/3681:
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
1 lock held by syz-executor291/3682:
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
1 lock held by syz-executor291/3683:
1 lock held by syz-executor291/3684:
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294
1 lock held by syz-executor291/3685:
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:97 [inline]
#0: ffffffff91d48cf8 (nfnl_subsys_ipset){+.+.}-{3:3}, at: nfnetlink_rcv_msg+0xaae/0x1430 net/netfilter/nfnetlink.c:294

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x333/0x3c0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xc75/0xfc0 kernel/hung_task.c:377
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3683 Comm: syz-executor291 Not tainted 6.1.0-rc5-syzkaller-00204-g08e8a949f684 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:ip_set_hostmask include/linux/netfilter/ipset/pfxlen.h:28 [inline]
RIP: 0010:ip_set_range_to_cidr+0x4c/0x160 net/netfilter/ipset/pfxlen.c:178
Code: 01 00 00 00 53 bb 00 00 00 80 48 83 ec 10 89 74 24 04 48 89 54 24 08 eb 25 e8 70 ed 67 f9 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 <84> c0 74 08 3c 03 0f 8e dd 00 00 00 41 8b 1c 24 49 83 c4 10 e8 4b
RSP: 0018:ffffc90003dcf008 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: 00000000fffc0000 RCX: 0000000000000000
RDX: ffff8880783a57c0 RSI: ffffffff88182c10 RDI: 0000000000000001
RBP: 000000000000000f R08: 0000000000000001 R09: 0000000000000020
R10: 000000000000000f R11: 0000000000000000 R12: ffffffff8b638fb0
R13: 000000001aff8de1 R14: dffffc0000000000 R15: 000000001afc0000
FS: 0000555555f42300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555555f422c0 CR3: 0000000077d7d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
hash_net4_uadt+0x50c/0x9d0 net/netfilter/ipset/ip_set_hash_net.c:193
call_ad.constprop.0+0x101/0x760 net/netfilter/ipset/ip_set_core.c:1698
ip_set_ad.constprop.0.isra.0+0x4c7/0xac0 net/netfilter/ipset/ip_set_core.c:1787
nfnetlink_rcv_msg+0xbca/0x1430 net/netfilter/nfnetlink.c:301
netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540
nfnetlink_rcv+0x1b0/0x420 net/netfilter/nfnetlink.c:659
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2482
___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2565
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f2298c5e0e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc1c6fdb38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f2298c5e0e9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000007689c
R13: 00007ffc1c6fdb4c R14: 00007ffc1c6fdb60 R15: 00007ffc1c6fdb50
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.969 msecs


---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
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[Hillf Danton]

On 28 Nov 2022 13:46:35 -0800

> syzbot found the following issue on:
>
> HEAD commit: 08e8a949f684 net: wwan: t7xx: Fix the ACPI memory leak
> git tree: net
> console output: https://syzkaller.appspot.com/x/log.txt?x=15cc5b2d880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=60808f80d41c27e5
> dashboard link: https://syzkaller.appspot.com/bug?extid=9204e7399656300bf271
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15569dc5880000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1437f803880000
>

Bail out in case of more elements than thought.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git 08e8a949f684

--- x/net/netfilter/ipset/ip_set_hash_net.c
+++ y/net/netfilter/ipset/ip_set_hash_net.c
@@ -192,6 +192,8 @@ hash_net4_uadt(struct ip_set *set, struc
do {
ipn = ip_set_range_to_cidr(ipn, ip_to, &e.cidr);
n++;
+ if (n > IPSET_MAX_RANGE)
+ return -ERANGE;
} while (ipn++ < ip_to);

if (n > IPSET_MAX_RANGE)
--

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: rcu detected stall in corrupted

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P4102 } 2679 jiffies s: 2805 root: 0x0/T
rcu: blocking rcu_node structures (internal RCU debug):


Tested on:

commit: 08e8a949 net: wwan: t7xx: Fix the ACPI memory leak
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git
console output: https://syzkaller.appspot.com/x/log.txt?x=14bd02ad880000

kernel config: https://syzkaller.appspot.com/x/.config?x=60808f80d41c27e5
dashboard link: https://syzkaller.appspot.com/bug?extid=9204e7399656300bf271
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

patch: https://syzkaller.appspot.com/x/patch.diff?x=173c8fed880000