================================================================== BUG: KASAN: slab-use-after-free in v4l2_fh_init drivers/media/v4l2-core/v4l2-fh.c:25 [inline] BUG: KASAN: slab-use-after-free in v4l2_fh_open+0xcb/0x430 drivers/media/v4l2-core/v4l2-fh.c:63 Read of size 8 at addr ffff8880250f4740 by task v4l_id/5587 CPU: 0 PID: 5587 Comm: v4l_id Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 v4l2_fh_init drivers/media/v4l2-core/v4l2-fh.c:25 [inline] v4l2_fh_open+0xcb/0x430 drivers/media/v4l2-core/v4l2-fh.c:63 em28xx_v4l2_open+0x14c/0x9d0 drivers/media/usb/em28xx/em28xx-video.c:2155 v4l2_open+0x234/0x370 drivers/media/v4l2-core/v4l2-dev.c:427 chrdev_open+0x5b2/0x630 fs/char_dev.c:414 do_dentry_open+0x972/0x1440 fs/open.c:959 vfs_open+0x3e/0x330 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2b3e/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6b3bf169a4 Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff8f9f4900 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fff8f9f4b18 RCX: 00007f6b3bf169a4 RDX: 0000000000000000 RSI: 00007fff8f9f4f1e RDI: 00000000ffffff9c RBP: 00007fff8f9f4f1e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff8f9f4b30 R14: 000055cc351b5670 R15: 00007f6b3c42da80 Allocated by task 5115: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4180 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] em28xx_v4l2_init+0xfd/0x2f40 drivers/media/usb/em28xx/em28xx-video.c:2534 em28xx_init_extension+0x122/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1117 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 5115: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2235 [inline] slab_free mm/slub.c:4464 [inline] kfree+0x149/0x360 mm/slub.c:4585 em28xx_free_v4l2 drivers/media/usb/em28xx/em28xx-video.c:2120 [inline] kref_put include/linux/kref.h:65 [inline] em28xx_v4l2_init+0x16d7/0x2f40 drivers/media/usb/em28xx/em28xx-video.c:2903 em28xx_init_extension+0x122/0x1c0 drivers/media/usb/em28xx/em28xx-core.c:1117 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff8880250f4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 1856 bytes inside of freed 8192-byte region [ffff8880250f4000, ffff8880250f6000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x250f0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015042280 ffffea00008ac200 dead000000000002 raw: 0000000000000000 0000000080020002 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015042280 ffffea00008ac200 dead000000000002 head: 0000000000000000 0000000080020002 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0000943c01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4773, tgid 4773 (dhcpcd-run-hook), ts 43825700247, free_ts 43809448318 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2304 allocate_slab+0x5a/0x2f0 mm/slub.c:2467 new_slab mm/slub.c:2520 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3706 __slab_alloc+0x58/0xa0 mm/slub.c:3796 __slab_alloc_node mm/slub.c:3849 [inline] slab_alloc_node mm/slub.c:4016 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4175 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] tomoyo_print_bprm security/tomoyo/audit.c:26 [inline] tomoyo_init_log+0x11ce/0x2050 security/tomoyo/audit.c:264 tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x178/0x210 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x1384/0x1cf0 security/tomoyo/domain.c:878 tomoyo_bprm_check_security+0x115/0x180 security/tomoyo/tomoyo.c:102 security_bprm_check+0x67/0x90 security/security.c:1191 search_binary_handler fs/exec.c:1809 [inline] exec_binprm fs/exec.c:1863 [inline] bprm_execve+0xa56/0x1770 fs/exec.c:1914 do_execveat_common+0x55f/0x6f0 fs/exec.c:2021 page last free pid 4771 tgid 4771 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2588 discard_slab mm/slub.c:2566 [inline] __put_partials+0xeb/0x130 mm/slub.c:3034 put_cpu_partial+0x17c/0x250 mm/slub.c:3109 __slab_free+0x2ea/0x3d0 mm/slub.c:4334 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3979 [inline] slab_alloc_node mm/slub.c:4028 [inline] __kmalloc_cache_noprof+0x132/0x2c0 mm/slub.c:4175 kmalloc_noprof include/linux/slab.h:681 [inline] tomoyo_print_header security/tomoyo/audit.c:156 [inline] tomoyo_init_log+0x1ca/0x2050 security/tomoyo/audit.c:255 tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline] tomoyo_path_number_perm+0x5e8/0x880 security/tomoyo/file.c:734 tomoyo_path_mknod+0x176/0x1b0 security/tomoyo/tomoyo.c:252 security_path_mknod+0xfa/0x150 security/security.c:1791 may_o_create fs/namei.c:3400 [inline] lookup_open fs/namei.c:3541 [inline] open_last_lookups fs/namei.c:3647 [inline] path_openat+0xca2/0x3470 fs/namei.c:3883 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 Memory state around the buggy address: ffff8880250f4600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880250f4680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880250f4700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880250f4780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880250f4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================