[syzbot] [wireless?] KMSAN: uninit-value in ieee80211_amsdu_to_8023s

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 39133352cbed Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=178741c2180000
kernel config: https://syzkaller.appspot.com/x/.config?x=1b015d567058472
dashboard link: https://syzkaller.appspot.com/bug?extid=d050d437fe47d479d210
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/72fbd705c5a5/disk-39133352.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4715a07937bd/vmlinux-39133352.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0340c0b3a7dc/bzImage-39133352.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d050d4...@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in ieee80211_amsdu_to_8023s+0x8c1/0x2d40 net/wireless/util.c:856
ieee80211_amsdu_to_8023s+0x8c1/0x2d40 net/wireless/util.c:856
__ieee80211_rx_h_amsdu+0x91a/0x13b0 net/mac80211/rx.c:3047
ieee80211_rx_h_amsdu net/mac80211/rx.c:3133 [inline]
ieee80211_rx_handlers+0x571a/0x10c40 net/mac80211/rx.c:4141
ieee80211_invoke_rx_handlers net/mac80211/rx.c:4185 [inline]
ieee80211_prepare_and_rx_handle+0x5640/0x9690 net/mac80211/rx.c:5033
__ieee80211_rx_handle_packet net/mac80211/rx.c:5239 [inline]
ieee80211_rx_list+0x642c/0x65d0 net/mac80211/rx.c:5410
ieee80211_rx_napi+0x84/0x3e0 net/mac80211/rx.c:5433
ieee80211_rx include/net/mac80211.h:4983 [inline]
ieee80211_tasklet_handler+0x19f/0x330 net/mac80211/main.c:318
tasklet_action_common+0x391/0xd30 kernel/softirq.c:780
tasklet_action+0x26/0x30 kernel/softirq.c:805
__do_softirq+0x1b7/0x7c5 kernel/softirq.c:553
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0x69/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x7c/0x90 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:649
update_stack_state+0x146/0x270
unwind_next_frame+0x1a2/0x480 arch/x86/kernel/unwind_frame.c:315
arch_stack_walk+0x1df/0x2c0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0xe0 kernel/stacktrace.c:122
kmsan_save_stack_with_flags mm/kmsan/core.c:74 [inline]
kmsan_internal_chain_origin+0x57/0xd0 mm/kmsan/core.c:183
__msan_chain_origin+0xc1/0x140 mm/kmsan/instrumentation.c:251
__skb_dst_copy include/net/dst.h:282 [inline]
skb_dst_copy include/net/dst.h:290 [inline]
__copy_skb_header+0x362/0x840 net/core/skbuff.c:1420
__skb_clone+0x57/0x650 net/core/skbuff.c:1471
skb_clone+0x3aa/0x540 net/core/skbuff.c:1961
__netlink_deliver_tap_skb net/netlink/af_netlink.c:300 [inline]
__netlink_deliver_tap+0x60a/0xc90 net/netlink/af_netlink.c:325
netlink_deliver_tap net/netlink/af_netlink.c:338 [inline]
__netlink_sendskb net/netlink/af_netlink.c:1285 [inline]
netlink_sendskb+0x232/0x260 net/netlink/af_netlink.c:1294
netlink_unicast+0x70e/0x1250 net/netlink/af_netlink.c:1382
nlmsg_unicast include/net/netlink.h:1144 [inline]
netlink_ack+0x1954/0x1a70 net/netlink/af_netlink.c:2505
netlink_rcv_skb+0x50a/0x650 net/netlink/af_netlink.c:2549
genl_rcv+0x40/0x60 net/netlink/genetlink.c:1217
netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
netlink_unicast+0xf49/0x1250 net/netlink/af_netlink.c:1367
netlink_sendmsg+0x1238/0x13d0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x735/0xa10 net/socket.c:2191
__do_compat_sys_socketcall net/compat.c:475 [inline]
__se_compat_sys_socketcall+0xcea/0x1a10 net/compat.c:423
__ia32_compat_sys_socketcall+0x6b/0xa0 net/compat.c:423
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb5/0x110 arch/x86/entry/common.c:321
do_fast_syscall_32+0x37/0x70 arch/x86/entry/common.c:346
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:384
entry_SYSENTER_compat_after_hwframe+0x70/0x7a

Local variable hdr created at:
ieee80211_amsdu_to_8023s+0x5b/0x2d40 net/wireless/util.c:832
__ieee80211_rx_h_amsdu+0x91a/0x13b0 net/mac80211/rx.c:3047

CPU: 1 PID: 6024 Comm: syz-executor.4 Not tainted 6.8.0-rc5-syzkaller-00029-g39133352cbed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 58c806d867bf Merge tag 'phy-fixes2-6.8' of git://git.kerne..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12374c96180000
kernel config: https://syzkaller.appspot.com/x/.config?x=80c7a82a572c0de3

dashboard link: https://syzkaller.appspot.com/bug?extid=d050d437fe47d479d210
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14227612180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=134411a2180000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b2b0ed9886ae/disk-58c806d8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/372dff1b6033/vmlinux-58c806d8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d2b87ebe3e7b/bzImage-58c806d8.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d050d4...@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in ieee80211_amsdu_to_8023s+0x8c1/0x2d40 net/wireless/util.c:856
ieee80211_amsdu_to_8023s+0x8c1/0x2d40 net/wireless/util.c:856
__ieee80211_rx_h_amsdu+0x91a/0x13b0 net/mac80211/rx.c:3047
ieee80211_rx_h_amsdu net/mac80211/rx.c:3133 [inline]
ieee80211_rx_handlers+0x571a/0x10c40 net/mac80211/rx.c:4141
ieee80211_invoke_rx_handlers net/mac80211/rx.c:4185 [inline]
ieee80211_prepare_and_rx_handle+0x5640/0x9690 net/mac80211/rx.c:5033
__ieee80211_rx_handle_packet net/mac80211/rx.c:5239 [inline]
ieee80211_rx_list+0x642c/0x65d0 net/mac80211/rx.c:5410
ieee80211_rx_napi+0x84/0x3e0 net/mac80211/rx.c:5433
ieee80211_rx include/net/mac80211.h:4983 [inline]
ieee80211_tasklet_handler+0x19f/0x330 net/mac80211/main.c:318
tasklet_action_common+0x391/0xd30 kernel/softirq.c:780
tasklet_action+0x26/0x30 kernel/softirq.c:805
__do_softirq+0x1b7/0x7c5 kernel/softirq.c:553

run_ksoftirqd+0x24/0x40 kernel/softirq.c:921
smpboot_thread_fn+0x558/0xa60 kernel/smpboot.c:164
kthread+0x3ed/0x550 kernel/kthread.c:388
ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:243

Local variable hdr created at:
ieee80211_amsdu_to_8023s+0x5b/0x2d40 net/wireless/util.c:832
__ieee80211_rx_h_amsdu+0x91a/0x13b0 net/mac80211/rx.c:3047

CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 6.8.0-rc6-syzkaller-00278-g58c806d867bf #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
=====================================================


---

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.