EXT4-fs (loop7): VFS: Can't find ext4 filesystem FAT-fs (loop4): Directory bread(block 2) failed FAT-fs (loop4): Directory bread(block 3) failed ================================================================== 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+0x1be/0x1f0 net/bluetooth/rfcomm/core.c:549 Read of size 1 at addr ffff8801d2c1b484 by task syz-executor7/26132 FAT-fs (loop4): Directory bread(block 4) failed CPU: 0 PID: 26132 Comm: syz-executor7 Not tainted 4.18.0-rc5-next-20180720+ #12 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+0x1c9/0x2b4 lib/dump_stack.c:113 FAT-fs (loop4): Directory bread(block 5) failed print_address_description+0x6c/0x20b mm/kasan/report.c:256 FAT-fs (loop4): Directory bread(block 6) failed kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 rfcomm_dlc_get net/bluetooth/rfcomm/core.c:360 [inline] rfcomm_dlc_exists+0x1be/0x1f0 net/bluetooth/rfcomm/core.c:549 __rfcomm_create_dev net/bluetooth/rfcomm/tty.c:413 [inline] rfcomm_create_dev net/bluetooth/rfcomm/tty.c:486 [inline] rfcomm_dev_ioctl+0x105e/0x2240 net/bluetooth/rfcomm/tty.c:588 FAT-fs (loop4): Directory bread(block 7) failed FAT-fs (loop4): Directory bread(block 8) failed rfcomm_sock_ioctl+0x89/0xb0 net/bluetooth/rfcomm/sock.c:902 sock_do_ioctl+0xe4/0x3e0 net/socket.c:951 FAT-fs (loop4): Directory bread(block 9) failed FAT-fs (loop4): Directory bread(block 10) failed sock_ioctl+0x30d/0x680 net/socket.c:1075 FAT-fs (loop4): Directory bread(block 11) failed vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 attempt to access beyond end of device loop4: rw=1, want=73, limit=2 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f46b0b73c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f46b0b746d4 RCX: 0000000000455ab9 RDX: 0000000020000140 RSI: 00000000400452c8 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bdaad R14: 00000000004cc4c0 R15: 0000000000000000 Allocated by task 23864: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] rfcomm_dlc_alloc+0xb8/0x490 net/bluetooth/rfcomm/core.c:305 rfcomm_sock_alloc.constprop.6+0x13a/0x420 net/bluetooth/rfcomm/sock.c:286 rfcomm_sock_create+0xf0/0x2b0 net/bluetooth/rfcomm/sock.c:329 bt_sock_create+0x16b/0x2d0 net/bluetooth/af_bluetooth.c:130 __sock_create+0x53c/0x940 net/socket.c:1268 sock_create net/socket.c:1308 [inline] __sys_socket+0x106/0x260 net/socket.c:1338 __do_sys_socket net/socket.c:1347 [inline] __se_sys_socket net/socket.c:1345 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1345 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 26096: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 rfcomm_dlc_free+0x1e/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+0x1dfe/0x2240 net/bluetooth/rfcomm/tty.c:588 rfcomm_sock_ioctl+0x89/0xb0 net/bluetooth/rfcomm/sock.c:902 sock_do_ioctl+0xe4/0x3e0 net/socket.c:951 sock_ioctl+0x30d/0x680 net/socket.c:1075 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d2c1b340 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 324 bytes inside of 512-byte region [ffff8801d2c1b340, ffff8801d2c1b540) The buggy address belongs to the page: page:ffffea00074b06c0 count:1 mapcount:0 mapping:ffff8801da800940 index:0x0 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea00073f55c8 ffffea0007245f88 ffff8801da800940 raw: 0000000000000000 ffff8801d2c1b0c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d2c1b380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d2c1b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801d2c1b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d2c1b500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801d2c1b580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================