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KASAN: use-after-free Read in p54u_load_firmware_cb

Status: fixed on 2019/08/05 13:45
Subsystems: wireless usb
[Documentation on labels]
Reported-by: syzbot+200d4bb11b23d929335f@syzkaller.appspotmail.com
Fix commit: 6e41e2257f10 p54usb: Fix race between disconnect and firmware loading
First crash: 2026d, last: 1942d
▶ ▼ Duplicate bugs (1)
duplicates (1):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
KASAN: slab-out-of-bounds Read in p54u_load_firmware_cb wireless usb syz 8 1950d 2026d 0/28 closed as dup on 2019/08/13 13:28
▶ ▼ Discussions (11)
Title Replies (including bot) Last reply
[PATCH 4.4 00/76] 4.4.211-stable review 81 (81) 2020/01/22 20:52
[PATCH 3.16 000/132] 3.16.74-rc1 review 141 (141) 2019/11/19 20:40
[PATCH 4.14 00/80] 4.14.134-stable review 87 (87) 2019/07/19 04:44
[PATCH 4.9 00/54] 4.9.186-stable review 61 (61) 2019/07/19 04:41
[PATCH 5.2 00/61] 5.2.1-stable review 78 (78) 2019/07/14 06:02
[PATCH 5.1 000/138] 5.1.18-stable review 156 (156) 2019/07/14 06:01
[PATCH 4.19 00/91] 4.19.59-stable review 99 (99) 2019/07/14 05:34
Reminder: 12 open syzbot bugs in "net/wireless" subsystem 1 (1) 2019/06/25 05:51
[PATCH] network: wireless: p54u: Fix race between disconnect and firmware loading 6 (6) 2019/06/25 04:43
Reminder: 42 open syzbot bugs in usb subsystem 1 (1) 2019/06/25 03:44
KASAN: use-after-free Read in p54u_load_firmware_cb 8 (15) 2019/05/18 20:11
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2019/05/18 17:49 41m stern@rowland.harvard.edu patch https://github.com/google/kasan.git usb-fuzzer OK
2019/05/18 17:01 33m stern@rowland.harvard.edu patch https://github.com/google/kasan.git usb-fuzzer report log
2019/05/18 16:32 16m stern@rowland.harvard.edu patch https://github.com/google/kasan.git usb-fuzzer error
2019/05/18 15:13 35m stern@rowland.harvard.edu patch https://github.com/google/kasan.git usb-fuzzer report log
2019/05/17 20:46 14m stern@rowland.harvard.edu patch https://github.com/google/kasan.git usb-fuzzer error

Sample crash report:
usb 4-1: Direct firmware load for isl3887usb failed with error -2
usb 4-1: Firmware not found.
==================================================================
BUG: KASAN: use-after-free in p54u_load_firmware_cb.cold+0x97/0x13d drivers/net/wireless/intersil/p54/p54usb.c:936
Read of size 8 at addr ffff8881ca22f588 by task kworker/0:6/2861

CPU: 0 PID: 2861 Comm: kworker/0:6 Not tainted 5.2.0-rc1+ #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events request_firmware_work_func
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x67/0x231 mm/kasan/report.c:188
 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
 kasan_report+0xe/0x20 mm/kasan/common.c:614
 p54u_load_firmware_cb.cold+0x97/0x13d drivers/net/wireless/intersil/p54/p54usb.c:936
 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:785
 process_one_work+0x905/0x1570 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x30b/0x410 kernel/kthread.c:254
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

The buggy address belongs to the page:
page:ffffea0007288bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x200000000000000()
raw: 0200000000000000 0000000000000000 ffffffff07280101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ca22f480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881ca22f500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881ca22f580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff8881ca22f600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881ca22f680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (40):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/05/31 10:13 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f d9aaf3c2 .config console log report syz ci2-upstream-usb
2019/05/13 10:22 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 16ab1e89 .config console log report syz ci2-upstream-usb
2019/07/28 20:06 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 c85e1c5b .config console log report ci2-upstream-usb
2019/07/25 17:17 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 0d7a1249 .config console log report ci2-upstream-usb
2019/07/25 10:51 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 32329ceb .config console log report ci2-upstream-usb
2019/07/24 19:37 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 32329ceb .config console log report ci2-upstream-usb
2019/07/24 16:18 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 32329ceb .config console log report ci2-upstream-usb
2019/07/24 10:50 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 32329ceb .config console log report ci2-upstream-usb
2019/07/23 13:06 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 bb071d58 .config console log report ci2-upstream-usb
2019/07/22 07:22 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 b3c615f5 .config console log report ci2-upstream-usb
2019/07/21 22:37 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/21 16:46 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/21 06:19 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/21 04:11 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/20 21:27 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/20 06:35 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/20 00:34 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 1656845f .config console log report ci2-upstream-usb
2019/07/19 04:59 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 7bb222f7 .config console log report ci2-upstream-usb
2019/07/18 20:10 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 7bb222f7 .config console log report ci2-upstream-usb
2019/07/17 10:40 https://github.com/google/kasan.git usb-fuzzer 6a3599ceaa39 0d10349c .config console log report ci2-upstream-usb
2019/07/09 23:24 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report ci2-upstream-usb
2019/07/09 03:41 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report ci2-upstream-usb
2019/07/08 19:42 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report ci2-upstream-usb
2019/07/07 02:21 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report ci2-upstream-usb
2019/07/06 17:31 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report ci2-upstream-usb
2019/07/06 15:20 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 f62e1e85 .config console log report ci2-upstream-usb
2019/07/05 14:35 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 429efa16 .config console log report ci2-upstream-usb
2019/07/05 13:08 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 429efa16 .config console log report ci2-upstream-usb
2019/06/28 08:38 https://github.com/google/kasan.git usb-fuzzer 7829a896a587 7509bf36 .config console log report ci2-upstream-usb
2019/06/26 05:23 https://github.com/google/kasan.git usb-fuzzer 9939f56ee6c0 0a8d1a96 .config console log report ci2-upstream-usb
2019/06/14 02:10 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f d25bb7ad .config console log report ci2-upstream-usb
2019/06/04 19:53 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f e41a20c5 .config console log report ci2-upstream-usb
2019/06/03 09:58 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/03 06:46 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/01 23:14 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/01 14:53 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/01 08:57 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/06/01 03:40 https://github.com/google/kasan.git usb-fuzzer 69bbe8c72e6f 53c81ea5 .config console log report ci2-upstream-usb
2019/05/13 09:27 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce 16ab1e89 .config console log report ci2-upstream-usb
2019/05/05 13:12 https://github.com/google/kasan.git usb-fuzzer 43151d6c3fce d28f4ce5 .config console log report ci2-upstream-usb
* Struck through repros no longer work on HEAD.