================================================================== BUG: KASAN: use-after-free in v4l2_ctrl_grab drivers/media/v4l2-core/v4l2-ctrls.c:2527 [inline] BUG: KASAN: use-after-free in v4l2_ctrl_grab+0x159/0x160 drivers/media/v4l2-core/v4l2-ctrls.c:2520 Read of size 8 at addr ffff8880a55f1720 by task syz-executor.5/11734 CPU: 0 PID: 11734 Comm: syz-executor.5 Not tainted 4.19.34 #2 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:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 v4l2_ctrl_grab drivers/media/v4l2-core/v4l2-ctrls.c:2527 [inline] v4l2_ctrl_grab+0x159/0x160 drivers/media/v4l2-core/v4l2-ctrls.c:2520 vicodec_stop_streaming+0x158/0x1a0 drivers/media/platform/vicodec/vicodec-core.c:1166 __vb2_queue_cancel+0xb4/0x970 drivers/media/common/videobuf2/videobuf2-core.c:1662 vb2_core_queue_release+0x28/0x80 drivers/media/common/videobuf2/videobuf2-core.c:2051 vb2_queue_release+0x16/0x20 drivers/media/common/videobuf2/videobuf2-v4l2.c:671 v4l2_m2m_ctx_release+0x2d/0x40 drivers/media/v4l2-core/v4l2-mem2mem.c:928 vicodec_release+0xc0/0x120 drivers/media/platform/vicodec/vicodec-core.c:1304 v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448 __fput+0x2df/0x8b0 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:193 [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_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4120b1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 1a 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:00007fffac386e70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00000000004120b1 RDX: 0000001b2fe20000 RSI: 0000000000740490 RDI: 0000000000000003 RBP: 000000000073c900 R08: 00000000ffc1511e R09: 00000000ffc15122 R10: 00007fffac386f40 R11: 0000000000000293 R12: ffffffffffffffff R13: 000000000002e11d R14: 00000000000003e8 R15: 000000000073bf0c Allocated by task 11742: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node+0x51/0x80 mm/slab.c:3696 kmalloc_node include/linux/slab.h:557 [inline] kvmalloc_node+0x68/0x100 mm/util.c:423 kvmalloc include/linux/mm.h:577 [inline] kvzalloc include/linux/mm.h:585 [inline] v4l2_ctrl_new.part.0+0x214/0x1460 drivers/media/v4l2-core/v4l2-ctrls.c:2175 v4l2_ctrl_new drivers/media/v4l2-core/v4l2-ctrls.c:2108 [inline] v4l2_ctrl_new_std+0x22d/0x360 drivers/media/v4l2-core/v4l2-ctrls.c:2293 vicodec_open+0x1a8/0xb30 drivers/media/platform/vicodec/vicodec-core.c:1243 v4l2_open+0x1b8/0x360 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x247/0x6b0 fs/char_dev.c:417 do_dentry_open+0x4c6/0x1200 fs/open.c:777 vfs_open+0xa0/0xd0 fs/open.c:886 do_last fs/namei.c:3418 [inline] path_openat+0x10d7/0x4690 fs/namei.c:3534 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_sys_open+0x3fe/0x550 fs/open.c:1069 __do_sys_openat fs/open.c:1096 [inline] __se_sys_openat fs/open.c:1090 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1090 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11734: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x230 mm/slab.c:3822 kvfree+0x61/0x70 mm/util.c:452 v4l2_ctrl_handler_free drivers/media/v4l2-core/v4l2-ctrls.c:1929 [inline] v4l2_ctrl_handler_free+0x4a8/0x7e0 drivers/media/v4l2-core/v4l2-ctrls.c:1909 vicodec_release+0x6b/0x120 drivers/media/platform/vicodec/vicodec-core.c:1302 v4l2_release+0xfb/0x1a0 drivers/media/v4l2-core/v4l2-dev.c:448 __fput+0x2df/0x8b0 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:193 [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_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a55f1700 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 32 bytes inside of 256-byte region [ffff8880a55f1700, ffff8880a55f1800) The buggy address belongs to the page: page:ffffea0002957c40 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0xffff8880a55f15c0 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffffea00027eb0c8 ffffea000224af88 ffff88812c3f07c0 raw: ffff8880a55f15c0 ffff8880a55f10c0 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a55f1600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a55f1680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880a55f1700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a55f1780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb kobject: 'loop4' (00000000ffbda51e): fill_kobj_path: path = '/devices/virtual/block/loop4' ffff8880a55f1800: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ==================================================================