EXT4-fs error (device loop0): ext4_xattr_ibody_get:591: inode #18: comm syz-executor.0: corrupted in-inode xattr ================================================================== BUG: KASAN: use-after-free in get_max_inline_xattr_value_size+0x373/0x510 fs/ext4/inline.c:61 Read of size 4 at addr ffff8881a841f084 by task syz-executor.0/5054 CPU: 0 PID: 5054 Comm: syz-executor.0 Not tainted 5.4.219-syzkaller-00002-ga0eae55f26a0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x630 mm/kasan/report.c:384 __kasan_report+0xf6/0x130 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 get_max_inline_xattr_value_size+0x373/0x510 fs/ext4/inline.c:61 ext4_get_max_inline_size+0x139/0x1f0 fs/ext4/inline.c:112 ext4_try_to_write_inline_data+0xd9/0x1750 fs/ext4/inline.c:673 ext4_write_begin+0x247/0x1d50 fs/ext4/inode.c:1312 ext4_da_write_begin+0x4a8/0xf80 fs/ext4/inode.c:3110 generic_perform_write+0x2f9/0x5a0 mm/filemap.c:3311 __generic_file_write_iter+0x239/0x490 mm/filemap.c:3440 ext4_file_write_iter+0x495/0x10e0 fs/ext4/file.c:270 do_iter_readv_writev+0x529/0x740 fs/read_write.c:690 do_iter_write+0x16f/0x570 fs/read_write.c:970 iter_file_splice_write+0x887/0x10f0 fs/splice.c:746 splice_direct_to_actor+0x4c4/0xb20 fs/splice.c:976 do_splice_direct+0x2a0/0x3f0 fs/splice.c:1064 do_sendfile+0x8f2/0xf10 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1ce/0x230 fs/read_write.c:1511 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Allocated by task 155: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x131/0x1e0 mm/kasan/common.c:529 kmalloc include/linux/slab.h:556 [inline] kernfs_get_open_node fs/kernfs/file.c:571 [inline] kernfs_fop_open+0x849/0xac0 fs/kernfs/file.c:717 do_dentry_open+0x946/0x10f0 fs/open.c:796 do_last fs/namei.c:3495 [inline] path_openat+0x1603/0x3ea0 fs/namei.c:3614 do_filp_open+0x208/0x450 fs/namei.c:3644 do_sys_open+0x393/0x7e0 fs/open.c:1113 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 155: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x178/0x240 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0x80/0x150 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kfree+0xc6/0x260 mm/slub.c:4071 kernfs_fop_release+0x1a3/0x240 fs/kernfs/file.c:779 __fput+0x261/0x680 fs/file_table.c:281 task_work_run+0x186/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x1ba/0x1d0 arch/x86/entry/common.c:163 prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881a841f080 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 4 bytes inside of 64-byte region [ffff8881a841f080, ffff8881a841f0c0) The buggy address belongs to the page: page:ffffea0006a107c0 refcount:1 mapcount:0 mapping:ffff8881f5c03180 index:0x0 flags: 0x8000000000000200(slab) raw: 8000000000000200 dead000000000100 dead000000000122 ffff8881f5c03180 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x194/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x524/0x560 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x372/0x860 mm/page_alloc.c:4891 alloc_slab_page+0x39/0x3e0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x450 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x320/0x4a0 mm/slub.c:2667 __slab_alloc+0x5a/0x90 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x197/0x2b0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:759 [inline] f2fs_kvmalloc fs/f2fs/f2fs.h:3197 [inline] f2fs_kvzalloc fs/f2fs/f2fs.h:3203 [inline] init_free_nid_cache fs/f2fs/node.c:3187 [inline] f2fs_build_node_manager+0x938/0x1b80 fs/f2fs/node.c:3220 f2fs_fill_super+0x5efb/0x83d0 fs/f2fs/super.c:4051 mount_bdev+0x22d/0x340 fs/super.c:1417 legacy_get_tree+0xde/0x170 fs/fs_context.c:647 vfs_get_tree+0x85/0x260 fs/super.c:1547 do_new_mount+0x299/0x580 fs/namespace.c:2843 do_mount+0x6ac/0xe10 fs/namespace.c:3163 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+0x7fe/0x930 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0x8f/0x250 mm/page_alloc.c:4959 __free_slab+0x22b/0x2e0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x14f/0x180 mm/slub.c:2288 put_cpu_partial+0xb5/0x150 mm/slub.c:2324 __slab_free+0x2ac/0x370 mm/slub.c:2971 qlist_free_all+0x4c/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x174/0x190 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:507 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc_trace+0xd8/0x240 mm/slub.c:2854 kmalloc include/linux/slab.h:556 [inline] syslog_print+0x56/0x400 kernel/printk/printk.c:1386 do_syslog+0x971/0x9b0 kernel/printk/printk.c:1559 __do_sys_syslog kernel/printk/printk.c:1650 [inline] __se_sys_syslog kernel/printk/printk.c:1648 [inline] __x64_sys_syslog+0x78/0x90 kernel/printk/printk.c:1648 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881a841ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881a841f000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881a841f080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8881a841f100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881a841f180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop0): ext4_read_block_bitmap_nowait:430: comm syz-executor.0: Invalid block bitmap block 0 in block_group 0