From: syzbot <syzbot+98881958e1410ec7e53c@syzkaller.appspotmail.com>
To: drinkcat@chromium.org, felipe.balbi@linux.intel.com,
gregkh@linuxfoundation.org, jflat@chromium.org, joe@perches.com,
kai.heng.feng@canonical.com, linux-kernel@vger.kernel.org,
linux-usb@vger.kernel.org, mathias.nyman@linux.intel.com,
stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com
Subject: KASAN: invalid-free in hub_event
Date: Mon, 26 Nov 2018 06:55:03 -0800 [thread overview]
Message-ID: <00000000000094bcc5057b92843f@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: d6d460b89378 Merge tag 'dma-mapping-4.20-3' of git://git.i..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17bd99eb400000
kernel config: https://syzkaller.appspot.com/x/.config?x=73e2bc0cb6463446
dashboard link: https://syzkaller.appspot.com/bug?extid=98881958e1410ec7e53c
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+98881958e1410ec7e53c@syzkaller.appspotmail.com
erofs: read_super, device -> /dev/loop5
erofs: options ->
nouser_xattr,fault_injection=0x00000000000007ff,fowner>00000000000000000000,uid<00000000000000000000,subj_type=ntfs
erofs: cannot find valid erofs superblock
vhci_hcd: default hub control req: 0080 v0400 i0000 l0
==================================================================
BUG: KASAN: double-free or invalid-free in port_over_current_notify
drivers/usb/core/hub.c:5192 [inline]
BUG: KASAN: double-free or invalid-free in port_event
drivers/usb/core/hub.c:5241 [inline]
BUG: KASAN: double-free or invalid-free in hub_event+0xd97/0x4140
drivers/usb/core/hub.c:5384
CPU: 1 PID: 32710 Comm: kworker/1:3 Not tainted 4.20.0-rc3+ #129
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x244/0x39d lib/dump_stack.c:113
print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
kasan_report_invalid_free+0x64/0xa0 mm/kasan/report.c:336
__kasan_slab_free+0x13a/0x150 mm/kasan/kasan.c:501
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xcf/0x230 mm/slab.c:3817
port_over_current_notify drivers/usb/core/hub.c:5192 [inline]
port_event drivers/usb/core/hub.c:5241 [inline]
hub_event+0xd97/0x4140 drivers/usb/core/hub.c:5384
process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Allocated by task 32710:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
__do_kmalloc mm/slab.c:3722 [inline]
__kmalloc_track_caller+0x157/0x760 mm/slab.c:3737
kvasprintf+0xb5/0x150 lib/kasprintf.c:25
kasprintf+0xab/0xe0 lib/kasprintf.c:59
port_over_current_notify drivers/usb/core/hub.c:5185 [inline]
port_event drivers/usb/core/hub.c:5241 [inline]
hub_event+0xd5e/0x4140 drivers/usb/core/hub.c:5384
process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Freed by task 32580:
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
set_track mm/kasan/kasan.c:460 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
__cache_free mm/slab.c:3498 [inline]
kfree+0xcf/0x230 mm/slab.c:3817
port_over_current_notify drivers/usb/core/hub.c:5192 [inline]
port_event drivers/usb/core/hub.c:5241 [inline]
hub_event+0xd97/0x4140 drivers/usb/core/hub.c:5384
process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
kthread+0x35a/0x440 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff8881bf0d01c0
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8881bf0d01c0, ffff8881bf0d01e0)
The buggy address belongs to the page:
page:ffffea0006fc3400 count:1 mapcount:0 mapping:ffff8881da8001c0
index:0xffff8881bf0d0fc1
flags: 0x2fffc0000000200(slab)
raw: 02fffc0000000200 ffffea00074d4b88 ffffea0007528bc8 ffff8881da8001c0
raw: ffff8881bf0d0fc1 ffff8881bf0d0000 000000010000003d 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8881bf0d0080: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8881bf0d0100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8881bf0d0180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8881bf0d0200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8881bf0d0280: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
next reply other threads:[~2018-11-26 14:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-26 14:55 syzbot [this message]
2018-11-28 16:25 ` [PATCH] USB: Fix invalid-free bug in port_over_current_notify() Alan Stern
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=00000000000094bcc5057b92843f@google.com \
--to=syzbot+98881958e1410ec7e53c@syzkaller.appspotmail.com \
--cc=drinkcat@chromium.org \
--cc=felipe.balbi@linux.intel.com \
--cc=gregkh@linuxfoundation.org \
--cc=jflat@chromium.org \
--cc=joe@perches.com \
--cc=kai.heng.feng@canonical.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=mathias.nyman@linux.intel.com \
--cc=stern@rowland.harvard.edu \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).