linux-kernel - Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_request_ibss

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Message-ID: <68103f88.a70a0220.23e4d2.0036.GAE@google.com>
Date: Mon, 28 Apr 2025 19:55:04 -0700
From: syzbot <syzbot+4bcdddd48bb6f0be0da1@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] UBSAN: array-index-out-of-bounds in ieee80211_request_ibss_scan

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in ieee80211_request_ibss_scan

wlan1: Trigger new scan to find an IBSS to join
------------[ cut here ]------------
WARNING: CPU: 0 PID: 42 at net/mac80211/scan.c:1215 ieee80211_request_ibss_scan+0x83f/0x8c0 net/mac80211/scan.c:1215
Modules linked in:
CPU: 0 UID: 0 PID: 42 Comm: kworker/u4:3 Not tainted 6.15.0-rc4-syzkaller-gca91b9500108-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:ieee80211_request_ibss_scan+0x83f/0x8c0 net/mac80211/scan.c:1215
Code: e8 16 68 f7 f6 eb 05 e8 0f 68 f7 f6 b8 ea ff ff ff e9 ea f8 ff ff e8 00 68 f7 f6 90 0f 0b 90 e9 aa f8 ff ff e8 f2 67 f7 f6 90 <0f> 0b 90 eb dd 48 c7 c1 50 f8 7e 8f 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0000:ffffc900005df8a0 EFLAGS: 00010293
RAX: ffffffff8ac856de RBX: 0000000000000000 RCX: ffff88801d0cc880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000033 R08: 0000000000000000 R09: 1ffff920000bbec4
R10: dffffc0000000000 R11: fffff520000bbec5 R12: ffff88803e1ca9a8
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88803e1c8e80
FS:  0000000000000000(0000) GS:ffff88808d6cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4a7adaf8e5 CR3: 0000000058672000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ieee80211_sta_find_ibss net/mac80211/ibss.c:-1 [inline]
 ieee80211_ibss_work+0xde7/0x1060 net/mac80211/ibss.c:1670
 cfg80211_wiphy_work+0x2dc/0x460 net/wireless/core.c:435
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


Tested on:

commit:         ca91b950 Merge tag 'v6.15-rc4-ksmbd-server-fixes' of g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1059d374580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=714654674710be70
dashboard link: https://syzkaller.appspot.com/bug?extid=4bcdddd48bb6f0be0da1
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14a01374580000