On Mon, Jul 22, 2019 at 5:18 PM syzbot <syzbot+0abbda0523882250a97a@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 6d21a41b Add linux-next specific files for 20190718 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1377958fa00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3430a151e1452331 > dashboard link: https://syzkaller.appspot.com/bug?extid=0abbda0523882250a97a > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113e2bb7a00000 +drivers/bluetooth/hci_h5.c maintainers > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+0abbda0523882250a97a@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: use-after-free in h5_rx_3wire_hdr+0x35d/0x3c0 > /drivers/bluetooth/hci_h5.c:438 > Read of size 1 at addr ffff8880a161d1c8 by task syz-executor.4/12040 > > CPU: 1 PID: 12040 Comm: syz-executor.4 Not tainted 5.2.0-next-20190718 #41 > 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+0x172/0x1f0 /lib/dump_stack.c:113 > print_address_description.cold+0xd4/0x306 /mm/kasan/report.c:351 > __kasan_report.cold+0x1b/0x36 /mm/kasan/report.c:482 > kasan_report+0x12/0x17 /mm/kasan/common.c:612 > __asan_report_load1_noabort+0x14/0x20 /mm/kasan/generic_report.c:129 > h5_rx_3wire_hdr+0x35d/0x3c0 /drivers/bluetooth/hci_h5.c:438 > h5_recv+0x32f/0x500 /drivers/bluetooth/hci_h5.c:563 > hci_uart_tty_receive+0x279/0x790 /drivers/bluetooth/hci_ldisc.c:600 > tiocsti /drivers/tty/tty_io.c:2197 [inline] > tty_ioctl+0x949/0x14f0 /drivers/tty/tty_io.c:2573 > vfs_ioctl /fs/ioctl.c:46 [inline] > file_ioctl /fs/ioctl.c:509 [inline] > do_vfs_ioctl+0xdb6/0x13e0 /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+0xfd/0x6a0 /arch/x86/entry/common.c:296 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x459819 > Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f7a3b459c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459819 > RDX: 0000000020000080 RSI: 0000000000005412 RDI: 0000000000000003 > RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7a3b45a6d4 > R13: 00000000004c408a R14: 00000000004d7ff0 R15: 00000000ffffffff > > Allocated by task 9200: > save_stack+0x23/0x90 /mm/kasan/common.c:69 > set_track /mm/kasan/common.c:77 [inline] > __kasan_kmalloc /mm/kasan/common.c:487 [inline] > __kasan_kmalloc.constprop.0+0xcf/0xe0 /mm/kasan/common.c:460 > kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501 > __do_kmalloc_node /mm/slab.c:3615 [inline] > __kmalloc_node_track_caller+0x4e/0x70 /mm/slab.c:3629 > __kmalloc_reserve.isra.0+0x40/0xf0 /net/core/skbuff.c:141 > __alloc_skb+0x10b/0x5e0 /net/core/skbuff.c:209 > alloc_skb /./include/linux/skbuff.h:1055 [inline] > bt_skb_alloc /./include/net/bluetooth/bluetooth.h:339 [inline] > h5_rx_pkt_start+0xce/0x270 /drivers/bluetooth/hci_h5.c:474 > h5_recv+0x32f/0x500 /drivers/bluetooth/hci_h5.c:563 > hci_uart_tty_receive+0x279/0x790 /drivers/bluetooth/hci_ldisc.c:600 > tty_ldisc_receive_buf+0x15f/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+0x222/0x390 /drivers/tty/tty_buffer.c:533 > process_one_work+0x9af/0x1740 /kernel/workqueue.c:2269 > worker_thread+0x98/0xe40 /kernel/workqueue.c:2415 > kthread+0x361/0x430 /kernel/kthread.c:255 > ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 > > Freed by task 9200: > save_stack+0x23/0x90 /mm/kasan/common.c:69 > set_track /mm/kasan/common.c:77 [inline] > __kasan_slab_free+0x102/0x150 /mm/kasan/common.c:449 > kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457 > __cache_free /mm/slab.c:3425 [inline] > kfree+0x10a/0x2c0 /mm/slab.c:3756 > skb_free_head+0x93/0xb0 /net/core/skbuff.c:591 > skb_release_data+0x42d/0x7c0 /net/core/skbuff.c:611 > skb_release_all+0x4d/0x60 /net/core/skbuff.c:665 > __kfree_skb /net/core/skbuff.c:679 [inline] > kfree_skb /net/core/skbuff.c:697 [inline] > kfree_skb+0x101/0x3c0 /net/core/skbuff.c:691 > h5_reset_rx+0x4c/0x120 /drivers/bluetooth/hci_h5.c:530 > h5_rx_3wire_hdr+0x2f5/0x3c0 /drivers/bluetooth/hci_h5.c:440 > h5_recv+0x32f/0x500 /drivers/bluetooth/hci_h5.c:563 > hci_uart_tty_receive+0x279/0x790 /drivers/bluetooth/hci_ldisc.c:600 > tty_ldisc_receive_buf+0x15f/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+0x222/0x390 /drivers/tty/tty_buffer.c:533 > process_one_work+0x9af/0x1740 /kernel/workqueue.c:2269 > worker_thread+0x98/0xe40 /kernel/workqueue.c:2415 > kthread+0x361/0x430 /kernel/kthread.c:255 > ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352 > > The buggy address belongs to the object at ffff8880a161d1c0 > which belongs to the cache kmalloc-8k of size 8192 > The buggy address is located 8 bytes inside of > 8192-byte region [ffff8880a161d1c0, ffff8880a161f1c0) > The buggy address belongs to the page: > page:ffffea0002858700 refcount:1 mapcount:0 mapping:ffff8880aa4021c0 > index:0x0 compound_mapcount: 0 > flags: 0x1fffc0000010200(slab|head) > raw: 01fffc0000010200 ffffea0002850508 ffffea000262ed08 ffff8880aa4021c0 > raw: 0000000000000000 ffff8880a161d1c0 0000000100000001 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8880a161d080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8880a161d100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ffff8880a161d180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > ^ > ffff8880a161d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8880a161d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000003fd4ab058e46951f%40google.com.
