EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue ================================================================== BUG: KASAN: use-after-free in ext4_write_inline_data fs/ext4/inline.c:246 [inline] BUG: KASAN: use-after-free in ext4_write_inline_data_end+0x500/0x8c0 fs/ext4/inline.c:768 Write of size 70 at addr ffff8881df8e7016 by task syz-executor.3/2331 CPU: 1 PID: 2331 Comm: syz-executor.3 Not tainted 5.4.116-syzkaller-00001-g6aabee0aa2de #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+0x1d8/0x24e lib/dump_stack.c:118 print_address_description+0x9b/0x650 mm/kasan/report.c:384 __kasan_report+0x182/0x260 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:641 check_memory_region_inline mm/kasan/generic.c:141 [inline] check_memory_region+0x2a5/0x2e0 mm/kasan/generic.c:191 memcpy+0x38/0x50 mm/kasan/common.c:124 ext4_write_inline_data fs/ext4/inline.c:246 [inline] ext4_write_inline_data_end+0x500/0x8c0 fs/ext4/inline.c:768 ext4_write_end+0x1d5/0xe50 fs/ext4/inode.c:1446 generic_perform_write+0x403/0x5a0 mm/filemap.c:3303 __generic_file_write_iter+0x239/0x480 mm/filemap.c:3421 ext4_file_write_iter+0x49e/0x10e0 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1971 [inline] new_sync_write fs/read_write.c:483 [inline] __vfs_write+0x5ec/0x780 fs/read_write.c:496 vfs_write+0x212/0x4e0 fs/read_write.c:558 ksys_write+0x186/0x2b0 fs/read_write.c:611 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe7a45d7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9 RDX: 0000000000000082 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffeae3559df R14: 00007fe7a45d7300 R15: 0000000000022000 Allocated by task 142: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2829 [inline] kmem_cache_alloc+0x115/0x290 mm/slub.c:2834 getname_flags+0xba/0x640 fs/namei.c:141 user_path_at_empty+0x28/0x50 fs/namei.c:2683 user_path_at include/linux/namei.h:49 [inline] vfs_statx fs/stat.c:187 [inline] vfs_lstat include/linux/fs.h:3349 [inline] __do_sys_newlstat fs/stat.c:354 [inline] __se_sys_newlstat+0xde/0x860 fs/stat.c:348 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 142: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:333 [inline] __kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475 slab_free_hook mm/slub.c:1454 [inline] slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492 slab_free mm/slub.c:3072 [inline] kmem_cache_free+0xb8/0x5f0 mm/slub.c:3088 putname fs/namei.c:262 [inline] filename_lookup+0x4bb/0x6a0 fs/namei.c:2432 user_path_at include/linux/namei.h:49 [inline] vfs_statx fs/stat.c:187 [inline] vfs_lstat include/linux/fs.h:3349 [inline] __do_sys_newlstat fs/stat.c:354 [inline] __se_sys_newlstat+0xde/0x860 fs/stat.c:348 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff8881df8e6600 which belongs to the cache names_cache of size 4096 The buggy address is located 2582 bytes inside of 4096-byte region [ffff8881df8e6600, ffff8881df8e7600) The buggy address belongs to the page: page:ffffea00077e3800 refcount:1 mapcount:0 mapping:ffff8881f5cfa000 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5cfa000 raw: 0000000000000000 0000000000070007 00000001ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x19a/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x550/0x8b0 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x3a2/0x880 mm/page_alloc.c:4855 alloc_slab_page+0x39/0x3e0 mm/slub.c:342 allocate_slab mm/slub.c:1675 [inline] new_slab+0x97/0x460 mm/slub.c:1741 new_slab_objects mm/slub.c:2498 [inline] ___slab_alloc+0x330/0x4c0 mm/slub.c:2659 __slab_alloc mm/slub.c:2699 [inline] slab_alloc_node mm/slub.c:2784 [inline] slab_alloc mm/slub.c:2829 [inline] kmem_cache_alloc+0x18b/0x290 mm/slub.c:2834 getname_flags+0xba/0x640 fs/namei.c:141 user_path_at_empty+0x28/0x50 fs/namei.c:2683 user_path_at include/linux/namei.h:49 [inline] vfs_statx fs/stat.c:187 [inline] vfs_lstat include/linux/fs.h:3349 [inline] __do_sys_newlstat fs/stat.c:354 [inline] __se_sys_newlstat+0xde/0x860 fs/stat.c:348 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0xc60/0xd80 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4917 [inline] __free_pages+0x8f/0x250 mm/page_alloc.c:4923 __free_slab+0x237/0x2f0 mm/slub.c:1766 free_slab mm/slub.c:1781 [inline] discard_slab mm/slub.c:1787 [inline] unfreeze_partials+0x14f/0x180 mm/slub.c:2279 put_cpu_partial+0xb5/0x150 mm/slub.c:2315 __slab_free mm/slub.c:2963 [inline] do_slab_free mm/slub.c:3060 [inline] ___cache_free+0x352/0x4e0 mm/slub.c:3079 qlist_free_all mm/kasan/quarantine.c:167 [inline] quarantine_reduce+0x17a/0x1e0 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2829 [inline] kmem_cache_alloc+0x115/0x290 mm/slub.c:2834 prepare_creds+0x20/0x370 kernel/cred.c:258 do_faccessat+0xa4/0x7a0 fs/open.c:360 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Memory state around the buggy address: ffff8881df8e6f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881df8e6f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881df8e7000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881df8e7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881df8e7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================