Hello,
syzbot found the following crash on:
HEAD commit: 7a92eb7cc1dc Add linux-next specific files for 20190215
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10b2f400c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b16fd68f18a50133
dashboard link: https://syzkaller.appspot.com/bug?extid=899a33dc0fa0dbaf06a6
compiler: gcc (GCC) 9.0.0 20181231 (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+899a33dc0fa0dbaf06a6@xxxxxxxxxxxxxxxxxxxxxxxxx
Bluetooth: Invalid header checksum
==================================================================
BUG: KASAN: use-after-free in h5_reset_rx+0xe0/0x100
drivers/bluetooth/hci_h5.c:544
Read of size 8 at addr ffff88809117be18 by task kworker/u4:4/880
CPU: 1 PID: 880 Comm: kworker/u4:4 Not tainted 5.0.0-rc6-next-20190215 #36
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:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
__asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
h5_reset_rx+0xe0/0x100 drivers/bluetooth/hci_h5.c:544
h5_rx_3wire_hdr+0x2f5/0x3c0 drivers/bluetooth/hci_h5.c:455
h5_recv+0x30a/0x4c0 drivers/bluetooth/hci_h5.c:578
hci_uart_tty_receive+0x22b/0x530 drivers/bluetooth/hci_ldisc.c:607
tty_ldisc_receive_buf+0x164/0x1c0 drivers/tty/tty_buffer.c:465
tty_port_default_receive_buf+0x7d/0xb0 drivers/tty/tty_port.c:38
receive_buf drivers/tty/tty_buffer.c:481 [inline]
flush_to_ldisc+0x228/0x390 drivers/tty/tty_buffer.c:533
process_one_work+0x98e/0x1790 kernel/workqueue.c:2267
worker_thread+0x98/0xe40 kernel/workqueue.c:2413
kthread+0x357/0x430 kernel/kthread.c:253
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Allocated by task 6242:
save_stack+0x45/0xd0 mm/kasan/common.c:75
set_track mm/kasan/common.c:87 [inline]
__kasan_kmalloc mm/kasan/common.c:497 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511
kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615
kmalloc include/linux/slab.h:548 [inline]
kzalloc include/linux/slab.h:743 [inline]
h5_open+0x4e4/0x5f0 drivers/bluetooth/hci_h5.c:222
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:686 [inline]
hci_uart_tty_ioctl+0x2d4/0xa70 drivers/bluetooth/hci_ldisc.c:748
tty_ioctl+0xac9/0x14d0 drivers/tty/tty_io.c:2664
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 6242:
save_stack+0x45/0xd0 mm/kasan/common.c:75
set_track mm/kasan/common.c:87 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:459
kasan_slab_free+0xe/0x10 mm/kasan/common.c:467
__cache_free mm/slab.c:3491 [inline]
kfree+0xcf/0x230 mm/slab.c:3816
h5_close+0x11a/0x150 drivers/bluetooth/hci_h5.c:266
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:696 [inline]
hci_uart_tty_ioctl+0x839/0xa70 drivers/bluetooth/hci_ldisc.c:748
tty_ioctl+0xac9/0x14d0 drivers/tty/tty_io.c:2664
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff88809117bb40
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 728 bytes inside of
1024-byte region [ffff88809117bb40, ffff88809117bf40)
The buggy address belongs to the page:
page:ffffea0002445e80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0x0
compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea000226a888 ffffea000097a788 ffff88812c3f0ac0
raw: 0000000000000000 ffff88809117a040 0000000100000007 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88809117bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88809117bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88809117be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88809117be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88809117bf00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
---
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