================================================================== BUG: KASAN: use-after-free in rfcomm_dlc_get net/bluetooth/rfcomm/core.c:360 [inline] BUG: KASAN: use-after-free in __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:396 [inline] BUG: KASAN: use-after-free in rfcomm_dlc_open+0xc9d/0xd80 net/bluetooth/rfcomm/core.c:431 Read of size 1 at addr ffff88809342d204 by task syz-executor.2/11428 CPU: 1 PID: 11428 Comm: syz-executor.2 Not tainted 5.3.0-rc3+ #127 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 rfcomm_dlc_get net/bluetooth/rfcomm/core.c:360 [inline] __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:396 [inline] rfcomm_dlc_open+0xc9d/0xd80 net/bluetooth/rfcomm/core.c:431 rfcomm_sock_connect+0x38a/0x4b0 net/bluetooth/rfcomm/sock.c:416 __sys_connect+0x264/0x330 net/socket.c:1828 __do_sys_connect net/socket.c:1839 [inline] __se_sys_connect net/socket.c:1836 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1836 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 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:00007f994ec40c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 RDX: 000000000000000e RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f994ec416d4 R13: 00000000004bfd0a R14: 00000000004d1ab0 R15: 00000000ffffffff Allocated by task 10368: 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:1043 [inline] nlmsg_new include/net/netlink.h:889 [inline] netlink_ack+0x25c/0xb30 net/netlink/af_netlink.c:2411 netlink_rcv_skb+0x376/0x450 net/netlink/af_netlink.c:2483 genl_rcv+0x29/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x8a5/0xd60 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:657 ___sys_sendmsg+0x803/0x920 net/socket.c:2311 __sys_sendmsg+0x105/0x1d0 net/socket.c:2356 __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2363 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10346: 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 skb_queue_purge+0x19/0x40 net/core/skbuff.c:3078 netlink_sock_destruct+0x115/0x2b0 net/netlink/af_netlink.c:394 __sk_destruct+0x53/0x6e0 net/core/sock.c:1695 sk_destruct+0x86/0xa0 net/core/sock.c:1734 __sk_free+0xfb/0x360 net/core/sock.c:1745 sk_free+0x42/0x50 net/core/sock.c:1756 deferred_put_nlk_sk+0x112/0x290 net/netlink/af_netlink.c:729 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2114 [inline] rcu_core+0x67f/0x1580 kernel/rcu/tree.c:2314 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323 __do_softirq+0x262/0x98c kernel/softirq.c:292 The buggy address belongs to the object at ffff88809342d0c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 324 bytes inside of 512-byte region [ffff88809342d0c0, ffff88809342d2c0) The buggy address belongs to the page: page:ffffea00024d0b40 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0xffff88809342d0c0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000243bec8 ffffea000256fac8 ffff8880aa400a80 raw: ffff88809342d0c0 ffff88809342d0c0 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809342d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809342d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809342d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809342d280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88809342d300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================