linux-kernel - [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in cfg80211_inform_bss_frame

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Message-ID: <684b6ff9.a00a0220.279073.0007.GAE@google.com>
Date: Thu, 12 Jun 2025 17:25:29 -0700
From: syzbot <syzbot+fd222bb38e916df26fa4@...kaller.appspotmail.com>
To: johannes@...solutions.net, linux-kernel@...r.kernel.org, 
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in cfg80211_inform_bss_frame_data

Hello,

syzbot found the following issue on:

HEAD commit:    d9816ec74e6d macsec: MACsec SCI assignment for ES = 0
git tree:       net
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10f6e682580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=73696606574e3967
dashboard link: https://syzkaller.appspot.com/bug?extid=fd222bb38e916df26fa4
compiler:       Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1042460c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1442460c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/245bc00fbf73/disk-d9816ec7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c0617f829e6a/vmlinux-d9816ec7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/61f77a9d202e/bzImage-d9816ec7.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fd222bb38e916df26fa4@...kaller.appspotmail.com

------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in net/wireless/scan.c:3288:35
index 4 is out of range for type 'u8[0]' (aka 'unsigned char[0]')
CPU: 0 UID: 0 PID: 5880 Comm: syz-executor169 Not tainted 6.15.0-syzkaller-12438-gd9816ec74e6d #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe9/0xf0 lib/ubsan.c:455
 cfg80211_inform_bss_frame_data+0x660/0x7b0 net/wireless/scan.c:3288
 ieee80211_bss_info_update+0x746/0x9e0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:355
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5179 [inline]
 ieee80211_rx_list+0x22fc/0x2d80 net/mac80211/rx.c:5416
 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5439
 ieee80211_rx include/net/mac80211.h:5185 [inline]
 ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:441
 tasklet_action_common+0x36c/0x580 kernel/softirq.c:829
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 do_softirq+0xec/0x180 kernel/softirq.c:480
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407
 ieee80211_tx_skb_tid+0x266/0x420 net/mac80211/tx.c:6118
 ieee80211_mgmt_tx+0x1c25/0x21d0 net/mac80211/offchannel.c:1023
 rdev_mgmt_tx net/wireless/rdev-ops.h:762 [inline]
 cfg80211_mlme_mgmt_tx+0x7ef/0x1620 net/wireless/mlme.c:938
 nl80211_tx_mgmt+0x9fd/0xd50 net/wireless/nl80211.c:12918
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:727
 ____sys_sendmsg+0x505/0x830 net/socket.c:2566
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fca6510a8e9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd603df8e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fca6510a8e9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000019549
R13: 00007ffd603df960 R14: 00007ffd603df91c R15: 00007ffd603df950
 </TASK>
---[ end trace ]---


---
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