[lkml]   [2022]   [Jun]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject[syzbot] KASAN: null-ptr-deref Read in ida_free (2)

syzbot found the following issue on:

HEAD commit: 08897940f458 Add linux-next specific files for 20220623
git tree: linux-next
kernel config:
dashboard link:
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:
C reproducer:

The issue was bisected to:

commit f2d8c2606825317b77db1f9ba0fc26ef26160b30
Author: Alan Stern <>
Date: Mon Jun 13 14:17:03 2022 +0000

usb: gadget: Fix non-unique driver names in raw-gadget driver

bisection log:
final oops:
console output:

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Fixes: f2d8c2606825 ("usb: gadget: Fix non-unique driver names in raw-gadget driver")

BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
BUG: KASAN: null-ptr-deref in ida_free+0x1b6/0x2e0 lib/idr.c:510
Read of size 8 at addr 0000000000000000 by task syz-executor185/3627

CPU: 1 PID: 3627 Comm: syz-executor185 Not tainted 5.19.0-rc3-next-20220623-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
kasan_report+0xbe/0x1f0 mm/kasan/report.c:495
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:71 [inline]
test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
ida_free+0x1b6/0x2e0 lib/idr.c:510
dev_free+0xec/0x700 drivers/usb/gadget/legacy/raw_gadget.c:212
kref_put include/linux/kref.h:65 [inline]
raw_release+0x219/0x290 drivers/usb/gadget/legacy/raw_gadget.c:424
__fput+0x277/0x9d0 fs/file_table.c:317
task_work_run+0xdd/0x1a0 kernel/task_work.c:177
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xb05/0x2a00 kernel/exit.c:795
do_group_exit+0xd2/0x2f0 kernel/exit.c:925
__do_sys_exit_group kernel/exit.c:936 [inline]
__se_sys_exit_group kernel/exit.c:934 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
RIP: 0033:0x7f12d28b6bd9
Code: Unable to access opcode bytes at RIP 0x7f12d28b6baf.
RSP: 002b:00007ffea2859da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f12d292b3f0 RCX: 00007f12d28b6bd9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 000000000000000b
R10: 00007ffea2857e00 R11: 0000000000000246 R12: 00007f12d292b3f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001

This report is generated by a bot. It may contain errors.
See for more information about syzbot.
syzbot engineers can be reached at

syzbot will keep track of this issue. See: for how to communicate with syzbot.
For information about bisection process see:
syzbot can test patches for this issue, for details see:

 \ /
  Last update: 2022-06-24 15:11    [W:0.048 / U:0.812 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site