general protection fault in tcf_action_destroy (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 30bb5572 Merge tag 'ktest-v5.6' of git://git.kernel.org/pu..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16849c39e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c2e311dba9a02ba9
dashboard link: https://syzkaller.appspot.com/bug?extid=92a80fff3b3af6c4464e
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13faf439e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16956ddde00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+92a80f...@syzkaller.appspotmail.com

batman_adv: batadv0: Interface activated: batadv_slave_1
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 9664 Comm: syz-executor420 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tcf_action_destroy+0x6a/0x150 net/sched/act_api.c:720
Code: 47 fb 83 c5 01 bf 20 00 00 00 48 83 c3 08 89 ee e8 8b 95 47 fb 83 fd 20 0f 84 ae 00 00 00 e8 0d 94 47 fb 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 ae 00 00 00 4c 8b 3b 4d 85 ff 0f 84 8b 00 00
RSP: 0018:ffffc90001d37018 EFLAGS: 00010247
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff862a7f63 RDI: 0000000000000004
RBP: 0000000000000000 R08: ffff8880a66c6080 R09: ffffed1015ce7074
R10: ffffed1015ce7073 R11: ffff8880ae73839b R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000008c74840
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000280 CR3: 000000009a35b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
tcf_exts_destroy+0x42/0xc0 net/sched/cls_api.c:3001
tcf_exts_change+0xf4/0x150 net/sched/cls_api.c:3059
tcindex_set_parms+0xed8/0x1a00 net/sched/cls_tcindex.c:456
tcindex_change+0x203/0x2e0 net/sched/cls_tcindex.c:518
tc_new_tfilter+0xa59/0x20b0 net/sched/cls_api.c:2103
rtnetlink_rcv_msg+0x810/0xad0 net/core/rtnetlink.c:5427
netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343
___sys_sendmsg+0x100/0x170 net/socket.c:2397
__sys_sendmsg+0xec/0x1b0 net/socket.c:2430
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x270/0xe8f arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
Modules linked in:
---[ end trace fac06a3fde273f0e ]---
RIP: 0010:tcf_action_destroy+0x6a/0x150 net/sched/act_api.c:720
Code: 47 fb 83 c5 01 bf 20 00 00 00 48 83 c3 08 89 ee e8 8b 95 47 fb 83 fd 20 0f 84 ae 00 00 00 e8 0d 94 47 fb 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 ae 00 00 00 4c 8b 3b 4d 85 ff 0f 84 8b 00 00
RSP: 0018:ffffc90001d37018 EFLAGS: 00010247
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff862a7f63 RDI: 0000000000000004
RBP: 0000000000000000 R08: ffff8880a66c6080 R09: ffffed1015ce7074
R10: ffffed1015ce7073 R11: ffff8880ae73839b R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae700000(0063) knlGS:0000000008c74840
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020000280 CR3: 000000009a35b000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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[syzbot]

syzbot has bisected this bug to:

commit 599be01ee567b61f4471ee8078870847d0a11e8e
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Mon Feb 3 05:14:35 2020 +0000

net_sched: fix an OOB access in cls_tcindex

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=170df5c3e00000
start commit: 30bb5572 Merge tag 'ktest-v5.6' of git://git.kernel.org/pu..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=148df5c3e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=108df5c3e00000

kernel config: https://syzkaller.appspot.com/x/.config?x=c2e311dba9a02ba9
dashboard link: https://syzkaller.appspot.com/bug?extid=92a80fff3b3af6c4464e

userspace arch: i386
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13faf439e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16956ddde00000

Reported-by: syzbot+92a80f...@syzkaller.appspotmail.com
Fixes: 599be01ee567 ("net_sched: fix an OOB access in cls_tcindex")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

syzbot suspects this bug was fixed by commit:

commit 0d1c3530e1bd38382edef72591b78e877e0edcd3
Author: Cong Wang <xiyou.w...@gmail.com>
Date: Thu Mar 12 05:42:28 2020 +0000

net_sched: keep alloc_hash updated after hash allocation

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15e74154100000
start commit: 67d584e3 Merge tag 'for-5.6-rc6-tag' of git://git.kernel.o..
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=9f894bd92023de02
dashboard link: https://syzkaller.appspot.com/bug?extid=92a80fff3b3af6c4464e
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160c3223e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f790ade00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: net_sched: keep alloc_hash updated after hash allocation

[Dmitry Vyukov]