UBSAN: array-index-out-of-bounds in decode_data

Status: closed as dup on 2021/07/19 20:22
Subsystems: hams
[Documentation on labels]
Reported-by: syzbot+70ba6cae2f44c82dcb76@syzkaller.appspotmail.com
First crash: 2029d, last: 1856d
Cause bisection: introduced by (bisect log) [release commit]:
commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Sun Sep 15 21:19:32 2019 +0000

  Linux 5.3

Crash: UBSAN: undefined-behaviour in decode_data (log)
Repro: syz .config
  
▶ ▼ Duplicate of
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported
KASAN: slab-out-of-bounds Write in decode_data hams 21 syz, C done error 7 2287d 2443d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
UBSAN: array-index-out-of-bounds in decode_data 1 (3) 2021/01/22 07:23
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2021/07/13 17:45 33m bisect fix upstream OK (0) job log log
2021/06/13 17:14 31m bisect fix upstream OK (0) job log log
2021/05/14 01:04 31m bisect fix upstream OK (0) job log log
2021/04/13 03:20 30m bisect fix upstream OK (0) job log log
2021/03/13 11:25 29m bisect fix upstream OK (0) job log log

Sample crash report:
================================================================================
UBSAN: array-index-out-of-bounds in drivers/net/hamradio/6pack.c:845:16
index 400 is out of range for type 'unsigned char [400]'
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:356
 decode_data.part.0+0x2c8/0x2e0 drivers/net/hamradio/6pack.c:845
 decode_data drivers/net/hamradio/6pack.c:965 [inline]
 sixpack_decode drivers/net/hamradio/6pack.c:968 [inline]
 sixpack_receive_buf drivers/net/hamradio/6pack.c:458 [inline]
 sixpack_receive_buf+0xd8c/0x1320 drivers/net/hamradio/6pack.c:435
 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:465
 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:481 [inline]
 flush_to_ldisc+0x20d/0x380 drivers/tty/tty_buffer.c:533
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
================================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 panic+0x306/0x73d kernel/panic.c:231
 ubsan_epilogue+0x54/0x5a lib/ubsan.c:162
 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:356
 decode_data.part.0+0x2c8/0x2e0 drivers/net/hamradio/6pack.c:845
 decode_data drivers/net/hamradio/6pack.c:965 [inline]
 sixpack_decode drivers/net/hamradio/6pack.c:968 [inline]
 sixpack_receive_buf drivers/net/hamradio/6pack.c:458 [inline]
 sixpack_receive_buf+0xd8c/0x1320 drivers/net/hamradio/6pack.c:435
 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:465
 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:38
 receive_buf drivers/tty/tty_buffer.c:481 [inline]
 flush_to_ldisc+0x20d/0x380 drivers/tty/tty_buffer.c:533
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/21 18:30 upstream 9791581c049c d4f4eca5 .config console log report syz ci-upstream-kasan-gce-selinux-root UBSAN: array-index-out-of-bounds in decode_data
2021/01/21 17:11 upstream 9791581c049c d4f4eca5 .config console log report info ci-upstream-kasan-gce-selinux-root UBSAN: array-index-out-of-bounds in decode_data
* Struck through repros no longer work on HEAD.