[syzbot] [bluetooth?] KASAN: wild-memory-access Read in l2cap_connect_cfm

From: syzbot
Date: Mon Mar 17 2025 - 12:07:00 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 78e3fd2b7e4b Merge remote-tracking branch 'will/for-next/p..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=15b05874580000
kernel config: https://syzkaller.appspot.com/x/.config?x=ddc962951c395b1d
dashboard link: https://syzkaller.appspot.com/bug?extid=0e4ebcc970728e056324
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6f8d7598ad09/disk-78e3fd2b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/493e8429a272/vmlinux-78e3fd2b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c843736f7c02/Image-78e3fd2b.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0e4ebcc970728e056324@xxxxxxxxxxxxxxxxxxxxxxxxx

kobject: kobject_add_internal failed for hci1:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci1: failed to register connection device
==================================================================
BUG: KASAN: wild-memory-access in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: wild-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: wild-memory-access in l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
BUG: KASAN: wild-memory-access in l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline]
BUG: KASAN: wild-memory-access in l2cap_connect_cfm+0x538/0xde4 net/bluetooth/l2cap_core.c:7245
Read of size 4 at addr deacfffffffffc8c by task kworker/u9:3/6449

CPU: 1 UID: 0 PID: 6449 Comm: kworker/u9:3 Not tainted 6.14.0-rc6-syzkaller-g78e3fd2b7e4b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci1 hci_rx_work
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
print_report+0xf8/0x550 mm/kasan/report.c:524
kasan_report+0xd8/0x138 mm/kasan/report.c:634
kasan_check_range+0x268/0x2a8 mm/kasan/generic.c:189
__kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31
instrument_atomic_read include/linux/instrumented.h:68 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline]
l2cap_connect_cfm+0x538/0xde4 net/bluetooth/l2cap_core.c:7245
hci_connect_cfm+0x120/0x1d4 include/net/bluetooth/hci_core.h:2051
le_conn_complete_evt+0xa70/0xf80 net/bluetooth/hci_event.c:5763
hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5789
hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7162
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x884/0x1060 net/bluetooth/hci_event.c:7525
hci_rx_work+0x31c/0xb04 net/bluetooth/hci_core.c:4015
process_one_work+0x810/0x1638 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x97c/0xeec kernel/workqueue.c:3400
kthread+0x65c/0x7b0 kernel/kthread.c:464
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
==================================================================
Unable to handle kernel paging request at virtual address fbd51fffffffff91
KASAN: maybe wild-memory-access in range [0xdeacfffffffffc88-0xdeacfffffffffc8f]
Mem abort info:
ESR = 0x0000000096000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[fbd51fffffffff91] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6449 Comm: kworker/u9:3 Tainted: G B 6.14.0-rc6-syzkaller-g78e3fd2b7e4b #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: hci1 hci_rx_work
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
pc : atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
pc : l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
pc : l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline]
pc : l2cap_connect_cfm+0x53c/0xde4 net/bluetooth/l2cap_core.c:7245
lr : instrument_atomic_read include/linux/instrumented.h:68 [inline]
lr : atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
lr : l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
lr : l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline]
lr : l2cap_connect_cfm+0x538/0xde4 net/bluetooth/l2cap_core.c:7245
sp : ffff8000a1577460
x29: ffff8000a1577500 x28: ffff0000d4756000 x27: 1fffe0001afe1a03
x26: dfff800000000000 x25: ffff0000d47564b0 x24: ffff0000d7f0d01a
x23: dead000000000100 x22: ffff0000d7f0d2c0 x21: 1fffe0001b467007
x20: ffff0000da33803d x19: deacfffffffffc8c x18: 1fffe000366f6086
x17: ffff80008fbbd000 x16: ffff80008b7cba1c x15: 0000000000000001
x14: 1ffff0001262eaf8 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000100000 x10: 00000000000596ee x9 : 0000000000000000
x8 : 1bd59fffffffff91 x7 : 1fffe000366f6087 x6 : ffff8000803d4bfc
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000802f88ec
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] (P)
atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] (P)
l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline] (P)
l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline] (P)
l2cap_connect_cfm+0x53c/0xde4 net/bluetooth/l2cap_core.c:7245 (P)
hci_connect_cfm+0x120/0x1d4 include/net/bluetooth/hci_core.h:2051
le_conn_complete_evt+0xa70/0xf80 net/bluetooth/hci_event.c:5763
hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5789
hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7162
hci_event_func net/bluetooth/hci_event.c:7470 [inline]
hci_event_packet+0x884/0x1060 net/bluetooth/hci_event.c:7525
hci_rx_work+0x31c/0xb04 net/bluetooth/hci_core.c:4015
process_one_work+0x810/0x1638 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x97c/0xeec kernel/workqueue.c:3400
kthread+0x65c/0x7b0 kernel/kthread.c:464
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862
Code: 52800081 aa1303e0 97568921 d343fe68 (38fa6908)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 52800081 mov w1, #0x4 // #4
4: aa1303e0 mov x0, x19
8: 97568921 bl 0xfffffffffd5a248c
c: d343fe68 lsr x8, x19, #3
* 10: 38fa6908 ldrsb w8, [x8, x26] <-- trapping instruction

---
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Next message: Niklas Söderlund: "Re: [PATCH v3 7/7] media: vsp1: pipe: Add RAW Bayer formats mapping"
Previous message: Kees Cook: "[GIT PULL] pstore update for v6.15-rc1"
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