R13: 00000000004c548a R14: 00000000004d9260 R15: 0000000000000005 ================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x7b/0x200 lib/refcount.c:120 Read of size 4 at addr ffff88804e227780 by task syz-executor5/20427 CPU: 0 PID: 20427 Comm: syz-executor5 Not tainted 5.0.0-rc4+ #44 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+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:100 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_inc_not_zero_checked+0x7b/0x200 lib/refcount.c:120 refcount_inc_checked+0x17/0x70 lib/refcount.c:153 sock_hold include/net/sock.h:647 [inline] nr_release+0x62/0x3c0 net/netrom/af_netrom.c:523 __sock_release+0xd3/0x250 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1163 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x92c/0x2db0 kernel/exit.c:867 do_group_exit+0x135/0x370 kernel/exit.c:971 get_signal+0x766/0x1750 kernel/signal.c:2517 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdb0cc5acf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 000000000073c048 RCX: 0000000000457e39 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000073c048 RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000073c04c R13: 00007ffe6540d3ff R14: 00007fdb0cc5b9c0 R15: 000000000073c04c Allocated by task 20418: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 __do_kmalloc mm/slab.c:3711 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3720 kmalloc include/linux/slab.h:550 [inline] sk_prot_alloc+0x19c/0x2e0 net/core/sock.c:1572 sk_alloc+0x39/0xf70 net/core/sock.c:1626 nr_create+0xb9/0x5e0 net/netrom/af_netrom.c:436 __sock_create+0x3e6/0x750 net/socket.c:1299 sock_create net/socket.c:1339 [inline] __sys_socket+0x103/0x220 net/socket.c:1369 __do_sys_socket net/socket.c:1378 [inline] __se_sys_socket net/socket.c:1376 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1376 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 20427: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 sk_prot_free net/core/sock.c:1609 [inline] __sk_destruct+0x4f1/0x6d0 net/core/sock.c:1691 sk_destruct+0x7b/0x90 net/core/sock.c:1699 __sk_free+0xce/0x300 net/core/sock.c:1710 sk_free+0x42/0x50 net/core/sock.c:1721 sock_put include/net/sock.h:1708 [inline] nr_release+0x337/0x3c0 net/netrom/af_netrom.c:557 __sock_release+0xd3/0x250 net/socket.c:579 sock_close+0x1b/0x30 net/socket.c:1163 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x92c/0x2db0 kernel/exit.c:867 do_group_exit+0x135/0x370 kernel/exit.c:971 get_signal+0x766/0x1750 kernel/signal.c:2517 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88804e227700 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff88804e227700, ffff88804e227f00) The buggy address belongs to the page: page:ffffea0001388980 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0xffff88804e226e80 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001953e88 ffffea00024f5988 ffff88812c3f0c40 raw: ffff88804e226e80 ffff88804e226600 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804e227680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804e227700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804e227780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804e227800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804e227880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================