================================================================== dccp_invalid_packet: P.Data Offset(80) too large BUG: KASAN: use-after-free in __lock_acquire+0x30e0/0x4700 kernel/locking/lockdep.c:3215 Read of size 8 at addr ffff888090170a80 by task syz-executor.2/30592 CPU: 0 PID: 30592 Comm: syz-executor.2 Not tainted 5.0.0-rc6+ #70 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 dccp_invalid_packet: P.Data Offset(80) too large print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __lock_acquire+0x30e0/0x4700 kernel/locking/lockdep.c:3215 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1310 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seccomp_notify_release+0x62/0x280 kernel/seccomp.c:982 __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 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:341 [inline] do_fast_syscall_32+0xa9d/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f3e869 Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:000000000845fdac EFLAGS: 00000216 ORIG_RAX: 0000000000000006 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 30593: 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 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] seccomp_prepare_filter kernel/seccomp.c:451 [inline] seccomp_prepare_user_filter kernel/seccomp.c:491 [inline] seccomp_set_mode_filter kernel/seccomp.c:1260 [inline] do_seccomp+0x73e/0x2250 kernel/seccomp.c:1374 __do_sys_seccomp kernel/seccomp.c:1393 [inline] __se_sys_seccomp kernel/seccomp.c:1390 [inline] __ia32_sys_seccomp+0x72/0xb0 kernel/seccomp.c:1390 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 30593: 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 seccomp_filter_free kernel/seccomp.c:565 [inline] seccomp_filter_free kernel/seccomp.c:561 [inline] seccomp_set_mode_filter kernel/seccomp.c:1315 [inline] do_seccomp+0xafb/0x2250 kernel/seccomp.c:1374 __do_sys_seccomp kernel/seccomp.c:1393 [inline] __se_sys_seccomp kernel/seccomp.c:1390 [inline] __ia32_sys_seccomp+0x72/0xb0 kernel/seccomp.c:1390 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x281/0xc98 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 The buggy address belongs to the object at ffff888090170a00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 128 bytes inside of 192-byte region [ffff888090170a00, ffff888090170ac0) The buggy address belongs to the page: page:ffffea0002405c00 count:1 mapcount:0 mapping:ffff88812c3f0040 index:0xffff888090170900 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0000f47b48 ffffea00028c0048 ffff88812c3f0040 raw: ffff888090170900 ffff888090170000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888090170980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888090170a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888090170a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888090170b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888090170b80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================