KASAN: use-after-free Read in skb_release_data

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 7d80e121 Linux 4.14.136
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16417652600000
kernel config: https://syzkaller.appspot.com/x/.config?x=4ca439d79e42214b
dashboard link: https://syzkaller.appspot.com/bug?extid=f421a6b7460852c68dea
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+f421a6...@syzkaller.appspotmail.com

Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
==================================================================
Bluetooth: Invalid header checksum
BUG: KASAN: use-after-free in skb_release_data+0x4e9/0x700
net/core/skbuff.c:567
Read of size 1 at addr ffff8880591a23c2 by task kworker/u4:50/14637
Bluetooth: Invalid header checksum

CPU: 1 PID: 14637 Comm: kworker/u4:50 Not tainted 4.14.136 #32
Bluetooth: Invalid header checksum
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:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
__asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427
skb_release_data+0x4e9/0x700 net/core/skbuff.c:567
Bluetooth: Invalid header checksum
skb_release_all+0x4d/0x60 net/core/skbuff.c:631
__kfree_skb net/core/skbuff.c:645 [inline]
kfree_skb+0xb5/0x340 net/core/skbuff.c:663
h5_reset_rx+0x4c/0x100 drivers/bluetooth/hci_h5.c:499
h5_rx_3wire_hdr+0x2af/0x370 drivers/bluetooth/hci_h5.c:409
h5_recv+0x25c/0x3f0 drivers/bluetooth/hci_h5.c:532
hci_uart_tty_receive+0x1f4/0x4d0 drivers/bluetooth/hci_ldisc.c:616
tty_ldisc_receive_buf+0x14d/0x1a0 drivers/tty/tty_buffer.c:459
Bluetooth: Invalid header checksum
tty_port_default_receive_buf+0x73/0xa0 drivers/tty/tty_port.c:37
Bluetooth: Invalid header checksum
receive_buf drivers/tty/tty_buffer.c:475 [inline]
flush_to_ldisc+0x1ec/0x400 drivers/tty/tty_buffer.c:527
process_one_work+0x863/0x1600 kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 14637:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
__do_kmalloc_node mm/slab.c:3682 [inline]
__kmalloc_node_track_caller+0x51/0x80 mm/slab.c:3696
__kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:137
__alloc_skb+0xcf/0x500 net/core/skbuff.c:205
alloc_skb include/linux/skbuff.h:980 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline]
h5_rx_pkt_start+0xc2/0x260 drivers/bluetooth/hci_h5.c:443
h5_recv+0x25c/0x3f0 drivers/bluetooth/hci_h5.c:532
hci_uart_tty_receive+0x1f4/0x4d0 drivers/bluetooth/hci_ldisc.c:616
Bluetooth: Invalid header checksum
tty_ldisc_receive_buf+0x14d/0x1a0 drivers/tty/tty_buffer.c:459
tty_port_default_receive_buf+0x73/0xa0 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:475 [inline]
flush_to_ldisc+0x1ec/0x400 drivers/tty/tty_buffer.c:527
process_one_work+0x863/0x1600 kernel/workqueue.c:2114
worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248
kthread+0x319/0x430 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 14689:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xcc/0x270 mm/slab.c:3815
skb_free_head+0x8b/0xb0 net/core/skbuff.c:554
skb_release_data+0x4af/0x700 net/core/skbuff.c:574
skb_release_all+0x4d/0x60 net/core/skbuff.c:631
Bluetooth: Invalid header checksum
__kfree_skb net/core/skbuff.c:645 [inline]
kfree_skb+0xb5/0x340 net/core/skbuff.c:663
h5_reset_rx+0x4c/0x100 drivers/bluetooth/hci_h5.c:499
h5_rx_3wire_hdr+0x2af/0x370 drivers/bluetooth/hci_h5.c:409
h5_recv+0x25c/0x3f0 drivers/bluetooth/hci_h5.c:532
hci_uart_tty_receive+0x1f4/0x4d0 drivers/bluetooth/hci_ldisc.c:616
tiocsti drivers/tty/tty_io.c:2186 [inline]
tty_ioctl+0xded/0x1320 drivers/tty/tty_io.c:2572
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8880591a0500
which belongs to the cache kmalloc-8192 of size 8192
The buggy address is located 7874 bytes inside of
8192-byte region [ffff8880591a0500, ffff8880591a2500)
The buggy address belongs to the page:
Bluetooth: Invalid header checksum
page:ffffea0001646800 count:1 mapcount:0 mapping:ffff8880591a0500 index:0x0
compound_mapcount: 0
flags: 0x1fffc0000008100(slab|head)
raw: 01fffc0000008100 ffff8880591a0500 0000000000000000 0000000100000001
raw: ffffea00016ccc20 ffffea00015a3a20 ffff8880aa802080 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8880591a2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880591a2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff8880591a2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880591a2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880591a2480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Bluetooth: Invalid header checksum
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kobject: 'loop4' (ffff8880a4a4ab20): kobject_uevent_env
Bluetooth: Invalid header checksum
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kobject: 'loop4' (ffff8880a4a4ab20): fill_kobj_path: path
= '/devices/virtual/block/loop4'
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
kobject: 'loop1' (ffff8880a491e9a0): kobject_uevent_env
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
kobject: 'loop1' (ffff8880a491e9a0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum
Bluetooth: Invalid header checksum


---
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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.