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BUG: KASAN: use-after-free in rfcomm_dlc_get net/bluetooth/rfcomm/core.c:360 [inline]
BUG: KASAN: use-after-free in rfcomm_dlc_exists+0x17d/0x1a0 net/bluetooth/rfcomm/core.c:550
Read of size 1 at addr ffff8880a821f544 by task syz-executor.2/27396
CPU: 1 PID: 27396 Comm: syz-executor.2 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
__kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
kasan_report+0x12/0x20 mm/kasan/common.c:639
__asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132
rfcomm_dlc_get net/bluetooth/rfcomm/core.c:360 [inline]
rfcomm_dlc_exists+0x17d/0x1a0 net/bluetooth/rfcomm/core.c:550
__rfcomm_create_dev net/bluetooth/rfcomm/tty.c:413 [inline]
rfcomm_create_dev net/bluetooth/rfcomm/tty.c:486 [inline]
rfcomm_dev_ioctl+0x9ff/0x1e80 net/bluetooth/rfcomm/tty.c:588
rfcomm_sock_ioctl+0x90/0xb0 net/bluetooth/rfcomm/sock.c:902
sock_do_ioctl+0xd8/0x2f0 net/socket.c:1040
sock_ioctl+0x3ed/0x790 net/socket.c:1191
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f13bb415c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000009
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f13bb4166d4
R13: 00000000004c3c64 R14: 00000000004da2d8 R15: 00000000ffffffff
Allocated by task 10743:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
__kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3551
kmalloc include/linux/slab.h:556 [inline]
kzalloc include/linux/slab.h:670 [inline]
rfcomm_dlc_alloc+0x82/0x410 net/bluetooth/rfcomm/core.c:305
rfcomm_sock_alloc.constprop.0+0xb3/0x370 net/bluetooth/rfcomm/sock.c:286
rfcomm_sock_create+0xf3/0x2b0 net/bluetooth/rfcomm/sock.c:329
bt_sock_create+0x16a/0x2d0 net/bluetooth/af_bluetooth.c:130
__sock_create+0x3ce/0x730 net/socket.c:1420
sock_create net/socket.c:1471 [inline]
__sys_socket+0x103/0x220 net/socket.c:1513
__do_sys_socket net/socket.c:1522 [inline]
__se_sys_socket net/socket.c:1520 [inline]
__x64_sys_socket+0x73/0xb0 net/socket.c:1520
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 27396:
save_stack+0x23/0x90 mm/kasan/common.c:72
set_track mm/kasan/common.c:80 [inline]
kasan_set_free_info mm/kasan/common.c:335 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
__cache_free mm/slab.c:3426 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3757
rfcomm_dlc_free+0x20/0x30 net/bluetooth/rfcomm/core.c:328
rfcomm_dlc_put include/net/bluetooth/rfcomm.h:258 [inline]
__rfcomm_create_dev net/bluetooth/rfcomm/tty.c:417 [inline]
rfcomm_create_dev net/bluetooth/rfcomm/tty.c:486 [inline]
rfcomm_dev_ioctl+0x1b9d/0x1e80 net/bluetooth/rfcomm/tty.c:588
rfcomm_sock_ioctl+0x90/0xb0 net/bluetooth/rfcomm/sock.c:902
sock_do_ioctl+0xd8/0x2f0 net/socket.c:1040
sock_ioctl+0x3ed/0x790 net/socket.c:1191
vfs_ioctl fs/ioctl.c:47 [inline]
file_ioctl fs/ioctl.c:545 [inline]
do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl fs/ioctl.c:754 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a821f400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 324 bytes inside of
512-byte region [ffff8880a821f400, ffff8880a821f600)
The buggy address belongs to the page:
page:ffffea0002a087c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0
raw: 00fffe0000000200 ffffea00015d9048 ffffea00027b28c8 ffff8880aa400a80
raw: 0000000000000000 ffff8880a821f000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a821f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a821f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a821f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880a821f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a821f600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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