IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready ================================================================== BUG: KASAN: use-after-free in snd_pcm_oss_release+0x283/0x300 sound/core/oss/pcm_oss.c:2554 Read of size 8 at addr ffff8880996de980 by task syz-executor.0/11633 CPU: 1 PID: 11633 Comm: syz-executor.0 Not tainted 4.19.142-syzkaller #0 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+0x1fc/0x2fe lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1c7 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 snd_pcm_oss_release+0x283/0x300 sound/core/oss/pcm_oss.c:2554 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416f01 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:00007ffdc3ed2680 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000416f01 RDX: 0000000000000000 RSI: 00000000011904b0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffdc3ed2770 R11: 0000000000000293 R12: 00000000011904b0 R13: 0000000000017299 R14: ffffffffffffffff R15: 000000000118cfec Allocated by task 11641: kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] snd_pcm_oss_open_file sound/core/oss/pcm_oss.c:2403 [inline] snd_pcm_oss_open.part.0+0x53e/0x12a0 sound/core/oss/pcm_oss.c:2506 snd_pcm_oss_open+0x3c/0x50 sound/core/oss/pcm_oss.c:2470 soundcore_open+0x445/0x600 sound/sound_core.c:598 chrdev_open+0x266/0x770 fs/char_dev.c:423 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11641: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2385 [inline] snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2375 [inline] snd_pcm_oss_release+0x17e/0x300 sound/core/oss/pcm_oss.c:2563 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880996de980 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8880996de980, ffff8880996de9a0) The buggy address belongs to the page: page:ffffea000265b780 count:1 mapcount:0 mapping:ffff88812c39c1c0 index:0xffff8880996defc1 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffffea00023f1848 ffffea000265ce48 ffff88812c39c1c0 raw: ffff8880996defc1 ffff8880996de000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880996de880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880996de900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8880996de980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880996dea00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8880996dea80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================