linux-kernel - [syzbot] [kernel?] KASAN: vmalloc-out-of-bounds Read in run_irq

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Message-ID: <68b3985f.a00a0220.1337b0.0028.GAE@google.com>
Date: Sat, 30 Aug 2025 17:33:35 -0700
From: syzbot <syzbot+2617fc732430968b45d2@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [kernel?] KASAN: vmalloc-out-of-bounds Read in run_irq_workd

Hello,

syzbot found the following issue on:

HEAD commit:    fab1beda7597 Merge tag 'devicetree-fixes-for-6.17-1' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1690def0580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e1e1566c7726877e
dashboard link: https://syzkaller.appspot.com/bug?extid=2617fc732430968b45d2
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=115f7c62580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5da7c25b1d17/disk-fab1beda.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1da8f2d76781/vmlinux-fab1beda.xz
kernel image: https://storage.googleapis.com/syzbot-assets/edda5f26e059/bzImage-fab1beda.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2617fc732430968b45d2@...kaller.appspotmail.com

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in irq_work_run_list kernel/irq_work.c:251 [inline]
BUG: KASAN: vmalloc-out-of-bounds in run_irq_workd+0x116/0x190 kernel/irq_work.c:305
Read of size 8 at addr ffffc90005289090 by task irq_work/1/26

CPU: 1 UID: 0 PID: 26 Comm: irq_work/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 irq_work_run_list kernel/irq_work.c:251 [inline]
 run_irq_workd+0x116/0x190 kernel/irq_work.c:305
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

The buggy address belongs to a vmalloc virtual mapping
Memory state around the buggy address:
 ffffc90005288f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90005289000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc90005289080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                         ^
 ffffc90005289100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90005289180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================


---
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