================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3369 Read of size 8 at addr ffff888057c90778 by task syz-executor.5/11132 CPU: 0 PID: 11132 Comm: syz-executor.5 Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:351 kasan_report syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:430 __lock_acquire+0x2c57/0x3f20 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3369 lock_acquire+0x170/0x3f0 syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:3998 __raw_write_lock_bh syzkaller/managers/linux-4-14/kernel/./include/linux/rwlock_api_smp.h:203 [inline] _raw_write_lock_bh+0x2f/0x40 syzkaller/managers/linux-4-14/kernel/kernel/locking/spinlock.c:320 sock_orphan syzkaller/managers/linux-4-14/kernel/./include/net/sock.h:1711 [inline] nr_release+0x5b/0x340 syzkaller/managers/linux-4-14/kernel/net/netrom/af_netrom.c:524 __sock_release+0xcd/0x2b0 syzkaller/managers/linux-4-14/kernel/net/socket.c:602 sock_close+0x15/0x20 syzkaller/managers/linux-4-14/kernel/net/socket.c:1139 __fput+0x25f/0x7a0 syzkaller/managers/linux-4-14/kernel/fs/file_table.c:210 task_work_run+0x11f/0x190 syzkaller/managers/linux-4-14/kernel/kernel/task_work.c:113 tracehook_notify_resume syzkaller/managers/linux-4-14/kernel/./include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:164 prepare_exit_to_usermode syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:199 [inline] syscall_return_slowpath syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x418e1b RSP: 002b:00007ffeda3bed00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000418e1b RDX: ffffffff871bbfb6 RSI: 0000001b2f63f570 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b30620000 R10: 001071316a6d1c1a R11: 0000000000000293 R12: 000000000056c9e0 R13: 00000000000ae46d R14: 000000000056c9e0 R15: 000000000056c158 Allocated by task 11133: save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:551 __do_kmalloc syzkaller/managers/linux-4-14/kernel/mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3729 kmalloc syzkaller/managers/linux-4-14/kernel/./include/linux/slab.h:493 [inline] sk_prot_alloc+0x1ba/0x290 syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1467 sk_alloc+0x36/0xcd0 syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1521 nr_create+0x99/0x5c0 syzkaller/managers/linux-4-14/kernel/net/netrom/af_netrom.c:436 __sock_create+0x303/0x620 syzkaller/managers/linux-4-14/kernel/net/socket.c:1275 sock_create syzkaller/managers/linux-4-14/kernel/net/socket.c:1315 [inline] SYSC_socket syzkaller/managers/linux-4-14/kernel/net/socket.c:1345 [inline] SyS_socket+0xd1/0x1b0 syzkaller/managers/linux-4-14/kernel/net/socket.c:1325 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 11132: save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:524 __cache_free syzkaller/managers/linux-4-14/kernel/mm/slab.c:3496 [inline] kfree+0xc9/0x250 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3815 sk_prot_free syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1504 [inline] __sk_destruct+0x5e3/0x760 syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1582 sk_destruct syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1597 [inline] __sk_free+0xd9/0x2d0 syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1605 sk_free+0x2b/0x40 syzkaller/managers/linux-4-14/kernel/net/core/sock.c:1616 sock_put syzkaller/managers/linux-4-14/kernel/./include/net/sock.h:1662 [inline] nr_release+0x2b7/0x340 syzkaller/managers/linux-4-14/kernel/net/netrom/af_netrom.c:557 __sock_release+0xcd/0x2b0 syzkaller/managers/linux-4-14/kernel/net/socket.c:602 sock_close+0x15/0x20 syzkaller/managers/linux-4-14/kernel/net/socket.c:1139 __fput+0x25f/0x7a0 syzkaller/managers/linux-4-14/kernel/fs/file_table.c:210 task_work_run+0x11f/0x190 syzkaller/managers/linux-4-14/kernel/kernel/task_work.c:113 tracehook_notify_resume syzkaller/managers/linux-4-14/kernel/./include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:164 prepare_exit_to_usermode syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:199 [inline] syscall_return_slowpath syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff888057c90400 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 888 bytes inside of 2048-byte region [ffff888057c90400, ffff888057c90c00) The buggy address belongs to the page: page:ffffea00015f2400 count:1 mapcount:0 mapping:ffff888057c90400 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff888057c90400 0000000000000000 0000000100000003 raw: ffffea0002affe20 ffffea000160c720 ffff88813fe80c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888057c90600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888057c90680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888057c90700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888057c90780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888057c90800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================