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with SMTP id q15mr43526139ior.59.1563808686394; Mon, 22 Jul 2019 08:18:06 -0700 (PDT) Date: Mon, 22 Jul 2019 08:18:06 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003fd4ab058e46951f@google.com> Subject: KASAN: use-after-free Read in h5_rx_3wire_hdr From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0abbda0523882250a97a@syzkaller.appspotmail.com ================================================================== 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@googlegroups.com. 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