syzbot


KASAN: slab-out-of-bounds Read in process_adv_report

Status: upstream: reported on 2022/09/25 03:48
Reported-by: syzbot+2730d8d265202f5a580b@syzkaller.appspotmail.com
First crash: 603d, last: 501d

Sample crash report:
Bluetooth: Unknown advertising packet type: 0xcaa0
Bluetooth: hci1: advertising data len corrected
Bluetooth: hci1: advertising data len corrected
Bluetooth: hci1: advertising data len corrected
==================================================================
BUG: KASAN: slab-out-of-bounds in process_adv_report+0xd8f/0xe70 net/bluetooth/hci_event.c:5215
Read of size 1 at addr ffff88809cced1e5 by task kworker/u5:8/8144

CPU: 0 PID: 8144 Comm: kworker/u5:8 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: hci1 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430
 process_adv_report+0xd8f/0xe70 net/bluetooth/hci_event.c:5215
 hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5470 [inline]
 hci_le_meta_evt+0x2049/0x3f20 net/bluetooth/hci_event.c:5714
 hci_event_packet+0x34ad/0x7e20 net/bluetooth/hci_event.c:5959
 hci_rx_work+0x4ad/0xc70 net/bluetooth/hci_core.c:4380
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 11878:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline]
 vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 2887:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 skb_free_head net/core/skbuff.c:563 [inline]
 skb_release_data+0x6de/0x920 net/core/skbuff.c:583
 skb_release_all net/core/skbuff.c:640 [inline]
 __kfree_skb net/core/skbuff.c:654 [inline]
 kfree_skb+0x11a/0x3d0 net/core/skbuff.c:672
 __netif_receive_skb_core+0x535/0x3270 net/core/dev.c:4928
 __netif_receive_skb_one_core+0xae/0x180 net/core/dev.c:4952
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5066
 process_backlog+0x241/0x700 net/core/dev.c:5849
 napi_poll net/core/dev.c:6280 [inline]
 net_rx_action+0x4ac/0xfb0 net/core/dev.c:6346
 __do_softirq+0x265/0x980 kernel/softirq.c:292

The buggy address belongs to the object at ffff88809ccecd80
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 101 bytes to the right of
 1024-byte region [ffff88809ccecd80, ffff88809cced180)
The buggy address belongs to the page:
page:ffffea0002733b00 count:1 mapcount:0 mapping:ffff88813bff0ac0 index:0xffff88809ccedb00 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffffea0002d16308 ffffea000286f288 ffff88813bff0ac0
raw: ffff88809ccedb00 ffff88809ccec000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809cced080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88809cced100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88809cced180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff88809cced200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809cced280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/05 09:06 linux-4.19.y 3f8a27f9e27b 1dac8c7a .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in process_adv_report
2022/10/03 23:09 linux-4.19.y 3f8a27f9e27b feb56351 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 KASAN: slab-out-of-bounds Read in process_adv_report
2022/09/25 03:47 linux-4.19.y 3f8a27f9e27b 0042f2b4 .config console log report info ci2-linux-4-19 KASAN: slab-out-of-bounds Read in process_adv_report
* Struck through repros no longer work on HEAD.