================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:183 [inline] BUG: KASAN: use-after-free in list_empty include/linux/list.h:203 [inline] BUG: KASAN: use-after-free in delete_and_unsubscribe_port+0x3c7/0x4a0 sound/core/seq/seq_ports.c:548 Read of size 8 at addr ffff88808aa5f890 by task syz-executor.0/22652 CPU: 1 PID: 22652 Comm: syz-executor.0 Not tainted 4.14.190-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __read_once_size include/linux/compiler.h:183 [inline] list_empty include/linux/list.h:203 [inline] delete_and_unsubscribe_port+0x3c7/0x4a0 sound/core/seq/seq_ports.c:548 snd_seq_port_disconnect+0x372/0x500 sound/core/seq/seq_ports.c:628 snd_seq_ioctl_unsubscribe_port+0x1d4/0x370 sound/core/seq/seq_clientmgr.c:1505 snd_seq_kernel_client_ctl+0xcb/0x110 sound/core/seq/seq_clientmgr.c:2360 snd_seq_oss_midi_close+0x29c/0x400 sound/core/seq/oss/seq_oss_midi.c:418 snd_seq_oss_synth_reset+0x39d/0x830 sound/core/seq/oss/seq_oss_synth.c:419 snd_seq_oss_reset+0x64/0x250 sound/core/seq/oss/seq_oss_init.c:448 snd_seq_oss_ioctl+0x9a5/0xc30 sound/core/seq/oss/seq_oss_ioctl.c:106 odev_ioctl+0x4f/0x90 sound/core/seq/oss/seq_oss.c:187 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cc79 RSP: 002b:00007fc7fd2b0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000000154c0 RCX: 000000000045cc79 RDX: 0000000000000000 RSI: 0000000000005100 RDI: 0000000000000003 RBP: 000000000078bfd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffdabb79c3f R14: 00007fc7fd2b19c0 R15: 000000000078bfac Allocated by task 22651: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] snd_seq_port_connect+0x5d/0x4d0 sound/core/seq/seq_ports.c:571 snd_seq_ioctl_subscribe_port+0x1d4/0x370 sound/core/seq/seq_clientmgr.c:1464 snd_seq_kernel_client_ctl+0xcb/0x110 sound/core/seq/seq_clientmgr.c:2360 snd_seq_oss_midi_open+0x485/0x590 sound/core/seq/oss/seq_oss_midi.c:377 snd_seq_oss_synth_setup_midi+0x104/0x4d0 sound/core/seq/oss/seq_oss_synth.c:282 snd_seq_oss_open+0x7a0/0x920 sound/core/seq/oss/seq_oss_init.c:274 odev_open+0x62/0x80 sound/core/seq/oss/seq_oss.c:138 soundcore_open+0x3ee/0x5a0 sound/sound_core.c:640 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 22651: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 snd_seq_port_disconnect+0x3f1/0x500 sound/core/seq/seq_ports.c:632 snd_seq_ioctl_unsubscribe_port+0x1d4/0x370 sound/core/seq/seq_clientmgr.c:1505 snd_seq_kernel_client_ctl+0xcb/0x110 sound/core/seq/seq_clientmgr.c:2360 snd_seq_oss_midi_close+0x29c/0x400 sound/core/seq/oss/seq_oss_midi.c:418 snd_seq_oss_synth_reset+0x39d/0x830 sound/core/seq/oss/seq_oss_synth.c:419 snd_seq_oss_reset+0x64/0x250 sound/core/seq/oss/seq_oss_init.c:448 snd_seq_oss_ioctl+0x9a5/0xc30 sound/core/seq/oss/seq_oss_ioctl.c:106 odev_ioctl+0x4f/0x90 sound/core/seq/oss/seq_oss.c:187 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff88808aa5f840 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 80 bytes inside of 128-byte region [ffff88808aa5f840, ffff88808aa5f8c0) The buggy address belongs to the page: page:ffffea00022a97c0 count:1 mapcount:0 mapping:ffff88808aa5f000 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff88808aa5f000 0000000000000000 0000000100000015 raw: ffffea00022a5960 ffffea00022ebce0 ffff88812fe52640 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808aa5f780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808aa5f800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff88808aa5f880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88808aa5f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808aa5f980: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================