================================================================== BUG: KASAN: use-after-free in atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x81/0x200 /lib/refcount.c:123 Read of size 4 at addr ffff88808caeed00 by task syz-executor.1/18737 CPU: 0 PID: 18737 Comm: syz-executor.1 Not tainted 5.2.0+ #96 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 check_memory_region_inline /mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 /mm/kasan/generic.c:192 __kasan_check_read+0x11/0x20 /mm/kasan/common.c:92 atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline] refcount_inc_not_zero_checked+0x81/0x200 /lib/refcount.c:123 refcount_inc_checked+0x17/0x70 /lib/refcount.c:156 sock_hold /./include/net/sock.h:649 [inline] nr_release+0x62/0x3e0 /net/netrom/af_netrom.c:520 __sock_release+0xce/0x280 /net/socket.c:590 sock_close+0x1e/0x30 /net/socket.c:1268 __fput+0x2ff/0x890 /fs/file_table.c:280 ____fput+0x16/0x20 /fs/file_table.c:313 task_work_run+0x145/0x1c0 /kernel/task_work.c:113 tracehook_notify_resume /./include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413501 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffcb8cd2110 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000413501 RDX: 0000000000000000 RSI: ffffffff8738d942 RDI: 0000000000000004 RBP: 0000000000000001 R08: ffffffff81338f1a R09: 000000001ec9dc07 R10: 00007ffcb8cd21f0 R11: 0000000000000293 R12: 000000000075c9a0 R13: 000000000075c9a0 R14: 0000000000760df8 R15: ffffffffffffffff Allocated by task 18740: 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 /mm/slab.c:3655 [inline] __kmalloc+0x163/0x770 /mm/slab.c:3664 kmalloc /./include/linux/slab.h:557 [inline] sk_prot_alloc+0x23a/0x310 /net/core/sock.c:1603 sk_alloc+0x39/0xf70 /net/core/sock.c:1657 nr_create+0xb9/0x5e0 /net/netrom/af_netrom.c:433 __sock_create+0x3d8/0x730 /net/socket.c:1418 sock_create /net/socket.c:1469 [inline] __sys_socket+0x103/0x220 /net/socket.c:1511 __do_sys_socket /net/socket.c:1520 [inline] __se_sys_socket /net/socket.c:1518 [inline] __x64_sys_socket+0x73/0xb0 /net/socket.c:1518 do_syscall_64+0xfd/0x6a0 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18737: 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 sk_prot_free /net/core/sock.c:1640 [inline] __sk_destruct+0x4f7/0x6e0 /net/core/sock.c:1726 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 sock_put /./include/net/sock.h:1725 [inline] nr_release+0x356/0x3e0 /net/netrom/af_netrom.c:554 __sock_release+0xce/0x280 /net/socket.c:590 sock_close+0x1e/0x30 /net/socket.c:1268 __fput+0x2ff/0x890 /fs/file_table.c:280 ____fput+0x16/0x20 /fs/file_table.c:313 task_work_run+0x145/0x1c0 /kernel/task_work.c:113 tracehook_notify_resume /./include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 /arch/x86/entry/common.c:163 prepare_exit_to_usermode /arch/x86/entry/common.c:194 [inline] syscall_return_slowpath /arch/x86/entry/common.c:274 [inline] do_syscall_64+0x5a9/0x6a0 /arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808caeec80 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff88808caeec80, ffff88808caef480) The buggy address belongs to the page: page:ffffea000232bb80 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0xffff88808caee400 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00018d5b08 ffffea000247d708 ffff8880aa400e00 raw: ffff88808caee400 ffff88808caee400 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808caeec00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808caeec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808caeed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808caeed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808caeee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================