netdev - [syzbot] [net?] [nfc?] KMSAN: uninit-value in nci_dev

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Message-ID: <6894dce2.050a0220.7f033.0049.GAE@google.com>
Date: Thu, 07 Aug 2025 10:05:38 -0700
From: syzbot <syzbot+740e04c2a93467a0f8c8@...kaller.appspotmail.com>
To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, 
	krzk@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] [nfc?] KMSAN: uninit-value in nci_dev_up (2)

Hello,

syzbot found the following issue on:

HEAD commit:    89748acdf226 Merge tag 'drm-next-2025-08-01' of https://gi..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=165cfcf0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7ff65239b4835001
dashboard link: https://syzkaller.appspot.com/bug?extid=740e04c2a93467a0f8c8
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10b88042580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=115cfcf0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ce090dd92dc2/disk-89748acd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/32b5903a7759/vmlinux-89748acd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dc68a867773d/bzImage-89748acd.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+740e04c2a93467a0f8c8@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in nci_init_req net/nfc/nci/core.c:177 [inline]
BUG: KMSAN: uninit-value in __nci_request net/nfc/nci/core.c:108 [inline]
BUG: KMSAN: uninit-value in nci_open_device net/nfc/nci/core.c:521 [inline]
BUG: KMSAN: uninit-value in nci_dev_up+0x13a2/0x1ba0 net/nfc/nci/core.c:632
 nci_init_req net/nfc/nci/core.c:177 [inline]
 __nci_request net/nfc/nci/core.c:108 [inline]
 nci_open_device net/nfc/nci/core.c:521 [inline]
 nci_dev_up+0x13a2/0x1ba0 net/nfc/nci/core.c:632
 nfc_dev_up+0x201/0x3d0 net/nfc/core.c:118
 nfc_genl_dev_up+0xe9/0x1c0 net/nfc/netlink.c:775
 genl_family_rcv_msg_doit+0x335/0x3f0 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xacf/0xc10 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x54a/0x680 net/netlink/af_netlink.c:2552
 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2703
 x64_sys_call+0x1dfd/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6169 at kernel/stacktrace.c:29 stack_trace_print+0xd4/0xf0 kernel/stacktrace.c:29
Modules linked in:
CPU: 1 UID: 0 PID: 6169 Comm: syz-executor421 Not tainted 6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:stack_trace_print+0xd4/0xf0 kernel/stacktrace.c:29
Code: 8f bc 03 92 89 de ba 20 00 00 00 4c 89 e1 e8 c3 5d 4d ff 49 83 c6 08 49 ff cd 0f 85 6e ff ff ff eb 0b e8 ff 26 c3 00 eb d4 90 <0f> 0b 90 5b 41 5c 41 5d 41 5e 41 5f 5d e9 9a 33 07 0f cc 66 0f 1f
RSP: 0018:ffff8881343b31c8 EFLAGS: 00010246
RAX: ffff888114afac20 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881343b31f0 R08: 0000000000000000 R09: 0000000000000000
R10: ffff888133bb3208 R11: 0000000000000001 R12: 0000000000000000
R13: 00000000abcd0100 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0c264ae6c0(0000) GS:ffff8881aa9a5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c26531650 CR3: 00000001193c6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kmsan_print_origin+0xb0/0x340 mm/kmsan/report.c:133
 kmsan_report+0x1d3/0x320 mm/kmsan/report.c:196
 __msan_warning+0x1b/0x30 mm/kmsan/instrumentation.c:315
 nci_init_req net/nfc/nci/core.c:177 [inline]
 __nci_request net/nfc/nci/core.c:108 [inline]
 nci_open_device net/nfc/nci/core.c:521 [inline]
 nci_dev_up+0x13a2/0x1ba0 net/nfc/nci/core.c:632
 nfc_dev_up+0x201/0x3d0 net/nfc/core.c:118
 nfc_genl_dev_up+0xe9/0x1c0 net/nfc/netlink.c:775
 genl_family_rcv_msg_doit+0x335/0x3f0 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xacf/0xc10 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x54a/0x680 net/netlink/af_netlink.c:2552
 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x10b3/0x1250 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x333/0x3d0 net/socket.c:729
 ____sys_sendmsg+0x7e0/0xd80 net/socket.c:2614
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2703
 x64_sys_call+0x1dfd/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0c264f62c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0c264ae218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0c2657f368 RCX: 00007f0c264f62c9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007f0c2657f360 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0c2654c074
R13: 0000200000000150 R14: 00002000000000c0 R15: 0000200000000300
 </TASK>
---[ end trace 0000000000000000 ]---

Uninit was stored to memory at:
 nci_core_reset_ntf_packet net/nfc/nci/ntf.c:36 [inline]
 nci_ntf_packet+0x179d/0x42b0 net/nfc/nci/ntf.c:812
 nci_rx_work+0x403/0x750 net/nfc/nci/core.c:1555
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xb8e/0x1d80 kernel/workqueue.c:3319
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3400
 kthread+0xd5c/0xf00 kernel/kthread.c:464
 ret_from_fork+0x1e0/0x310 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4186 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4281
 kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:578
 __alloc_skb+0x347/0x7d0 net/core/skbuff.c:669
 alloc_skb include/linux/skbuff.h:1336 [inline]
 virtual_ncidev_write+0x6b/0x430 drivers/nfc/virtual_ncidev.c:120
 vfs_write+0x463/0x1580 fs/read_write.c:684
 ksys_write fs/read_write.c:738 [inline]
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
 x64_sys_call+0x3014/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 6169 Comm: syz-executor421 Tainted: G        W           6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(none) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
=====================================================


---
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