================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_sub_return include/asm-generic/atomic-instrumented.h:160 [inline] BUG: KASAN: use-after-free in skb_release_data+0x11a/0x910 net/core/skbuff.c:604 Write of size 4 at addr ffff88807963a0e0 by task syz-executor.5/15797 CPU: 1 PID: 15797 Comm: syz-executor.5 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2c6 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 check_memory_region_inline mm/kasan/generic.c:179 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:185 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_sub_return include/asm-generic/atomic-instrumented.h:160 [inline] skb_release_data+0x11a/0x910 net/core/skbuff.c:604 skb_release_all net/core/skbuff.c:669 [inline] __kfree_skb net/core/skbuff.c:683 [inline] kfree_skb net/core/skbuff.c:701 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:695 hci_dev_do_open+0xa4a/0x1a00 net/bluetooth/hci_core.c:1619 hci_dev_open+0x132/0x300 net/bluetooth/hci_core.c:1685 hci_sock_ioctl+0x5b6/0x840 net/bluetooth/hci_sock.c:1025 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1037 sock_ioctl+0x477/0x6a0 net/socket.c:1177 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e107 Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 6d b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff90d57188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e107 RDX: 0000000000000003 RSI: 00000000400448c9 RDI: 0000000000000003 RBP: 00007fff90d571a0 R08: 0000000000000000 R09: 00007f93cc0cb700 R10: 00007f93cc0cb9d0 R11: 0000000000000246 R12: 0000000003248914 R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 15797: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x7f/0xa0 mm/kasan/common.c:429 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1099 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [inline] hci_prepare_cmd+0x2f/0x290 net/bluetooth/hci_request.c:292 hci_req_add_ev+0xdc/0x220 net/bluetooth/hci_request.c:326 bredr_init net/bluetooth/hci_core.c:205 [inline] hci_init1_req+0x273/0x300 net/bluetooth/hci_core.c:258 __hci_req_sync+0x138/0x8a0 net/bluetooth/hci_request.c:205 __hci_init net/bluetooth/hci_core.c:913 [inline] hci_dev_do_open+0x1070/0x1a00 net/bluetooth/hci_core.c:1571 hci_dev_open+0x132/0x300 net/bluetooth/hci_core.c:1685 hci_sock_ioctl+0x5b6/0x840 net/bluetooth/hci_sock.c:1025 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1037 sock_ioctl+0x477/0x6a0 net/socket.c:1177 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 8495: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xb0/0xe0 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:188 [inline] __cache_free mm/slab.c:3424 [inline] kfree+0xed/0x270 mm/slab.c:3760 skb_free_head net/core/skbuff.c:595 [inline] skb_release_data+0x6d9/0x910 net/core/skbuff.c:615 skb_release_all net/core/skbuff.c:669 [inline] __kfree_skb net/core/skbuff.c:683 [inline] kfree_skb net/core/skbuff.c:701 [inline] kfree_skb+0x133/0x3f0 net/core/skbuff.c:695 hci_cmd_work+0x182/0x390 net/bluetooth/hci_core.c:5005 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff88807963a000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 224 bytes inside of 512-byte region [ffff88807963a000, ffff88807963a200) The buggy address belongs to the page: page:00000000e39be0fc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7963a flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00009c21c8 ffffea000073e908 ffff888010040600 raw: 0000000000000000 ffff88807963a000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888079639f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807963a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807963a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807963a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807963a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================