================================================================== BUG: KASAN: slab-use-after-free in crc16+0x1fb/0x280 lib/crc16.c:58 Read of size 1 at addr ffff88802ae83000 by task ext4lazyinit/25424 CPU: 0 PID: 25424 Comm: ext4lazyinit Not tainted 6.3.0-syzkaller-12728-g348551ddaf31 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x163/0x540 mm/kasan/report.c:462 kasan_report+0x176/0x1b0 mm/kasan/report.c:572 crc16+0x1fb/0x280 lib/crc16.c:58 ext4_group_desc_csum+0x90f/0xc50 fs/ext4/super.c:3243 ext4_group_desc_csum_set+0x19b/0x240 fs/ext4/super.c:3266 ext4_init_inode_table+0x655/0x800 fs/ext4/ialloc.c:1612 ext4_run_li_request fs/ext4/super.c:3733 [inline] ext4_lazyinit_thread+0x789/0x19a0 fs/ext4/super.c:3824 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 5024: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc+0xb9/0x230 mm/slab_common.c:979 kmalloc_array include/linux/slab.h:596 [inline] kcalloc include/linux/slab.h:627 [inline] ext4_find_extent+0x36c/0xde0 fs/ext4/extents.c:914 ext4_ext_map_blocks+0x2d1/0x7210 fs/ext4/extents.c:4102 ext4_map_blocks+0x416/0x1cf0 fs/ext4/inode.c:548 ext4_append+0x247/0x5c0 fs/ext4/namei.c:75 ext4_init_new_dir+0x33e/0xa20 fs/ext4/namei.c:2955 ext4_mkdir+0x4f6/0xce0 fs/ext4/namei.c:3001 vfs_mkdir+0x29d/0x450 fs/namei.c:4115 do_mkdirat+0x264/0x520 fs/namei.c:4138 __do_sys_mkdirat fs/namei.c:4153 [inline] __se_sys_mkdirat fs/namei.c:4151 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5024: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0x264/0x3c0 mm/slub.c:3799 ext4_free_ext_path fs/ext4/extents.c:125 [inline] ext4_ext_map_blocks+0x25fc/0x7210 fs/ext4/extents.c:4379 ext4_map_blocks+0x416/0x1cf0 fs/ext4/inode.c:548 ext4_append+0x247/0x5c0 fs/ext4/namei.c:75 ext4_init_new_dir+0x33e/0xa20 fs/ext4/namei.c:2955 ext4_mkdir+0x4f6/0xce0 fs/ext4/namei.c:3001 vfs_mkdir+0x29d/0x450 fs/namei.c:4115 do_mkdirat+0x264/0x520 fs/namei.c:4138 __do_sys_mkdirat fs/namei.c:4153 [inline] __se_sys_mkdirat fs/namei.c:4151 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:491 kvfree_call_rcu+0x109/0x8d0 kernel/rcu/tree.c:3332 cfg80211_update_known_bss+0x166/0x9e0 cfg80211_bss_update+0x171/0x20d0 net/wireless/scan.c:1728 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2478 [inline] cfg80211_inform_bss_frame_data+0xc5b/0x22c0 net/wireless/scan.c:2511 ieee80211_bss_info_update+0x801/0xf00 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x192f/0x2cf0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1594 [inline] ieee80211_iface_work+0x7bd/0xd00 net/mac80211/iface.c:1648 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:491 kvfree_call_rcu+0x109/0x8d0 kernel/rcu/tree.c:3332 cfg80211_update_known_bss+0x166/0x9e0 cfg80211_bss_update+0x171/0x20d0 net/wireless/scan.c:1728 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2478 [inline] cfg80211_inform_bss_frame_data+0xc5b/0x22c0 net/wireless/scan.c:2511 ieee80211_bss_info_update+0x801/0xf00 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x192f/0x2cf0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1594 [inline] ieee80211_iface_work+0x7bd/0xd00 net/mac80211/iface.c:1648 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552 kthread+0x2b8/0x350 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88802ae83000 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of freed 96-byte region [ffff88802ae83000, ffff88802ae83060) The buggy address belongs to the physical page: page:ffffea0000aba0c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae83 anon flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff888012441780 ffffea0000b2cb80 dead000000000005 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 4451, tgid 4451 (udevd), ts 24010385856, free_ts 22533372257 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1722 prep_new_page mm/page_alloc.c:1729 [inline] get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3493 __alloc_pages+0x255/0x670 mm/page_alloc.c:4759 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192 __slab_alloc mm/slub.c:3291 [inline] __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x1b8/0x290 mm/slub.c:3490 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc+0xa8/0x230 mm/slab_common.c:979 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:680 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x530 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x598/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x254/0x4e0 security/tomoyo/file.c:771 security_file_open+0x63/0xa0 security/security.c:2797 do_dentry_open+0x308/0x10f0 fs/open.c:907 do_open fs/namei.c:3636 [inline] path_openat+0x27b3/0x3170 fs/namei.c:3791 do_filp_open+0x234/0x490 fs/namei.c:3818 do_sys_openat2+0x13f/0x500 fs/open.c:1356 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2555 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2650 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x11f/0x2e0 mm/slub.c:3475 getname_flags+0xbc/0x4e0 fs/namei.c:140 vfs_fstatat fs/stat.c:275 [inline] __do_sys_newfstatat fs/stat.c:446 [inline] __se_sys_newfstatat fs/stat.c:440 [inline] __x64_sys_newfstatat+0x12e/0x1d0 fs/stat.c:440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88802ae82f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802ae82f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802ae83000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88802ae83080: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88802ae83100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ==================================================================