EXT4-fs error (device loop3): ext4_xattr_ibody_get:591: inode #18: comm syz-executor.3: 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 ffff8881e456f108 by task syz-executor.3/1376 CPU: 1 PID: 1376 Comm: syz-executor.3 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 310: 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 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0xfb/0x280 mm/slub.c:4449 kstrdup+0x31/0x70 mm/util.c:60 simple_xattr_set+0xc8/0x4f0 fs/xattr.c:953 __vfs_setxattr+0x402/0x440 fs/xattr.c:150 __vfs_setxattr_noperm+0x12a/0x3e0 fs/xattr.c:181 vfs_setxattr+0x11e/0x2d0 fs/xattr.c:256 setxattr+0x1ea/0x3f0 fs/xattr.c:521 path_setxattr+0x174/0x250 fs/xattr.c:540 __do_sys_lsetxattr fs/xattr.c:562 [inline] __se_sys_lsetxattr fs/xattr.c:558 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:558 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 310: 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 simple_xattrs_free include/linux/xattr.h:99 [inline] shmem_evict_inode+0x86b/0xa20 mm/shmem.c:1118 evict+0x29b/0x6a0 fs/inode.c:575 do_unlinkat+0x51a/0x920 fs/namei.c:4150 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881e456f100 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff8881e456f100, ffff8881e456f120) The buggy address belongs to the page: page:ffffea0007915bc0 refcount:1 mapcount:0 mapping:ffff8881f5c03400 index:0x0 flags: 0x8000000000000200(slab) raw: 8000000000000200 0000000000000000 0000000100000001 ffff8881f5c03400 raw: 0000000000000000 0000000000400040 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL) 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 include/linux/slab.h:561 [inline] context_struct_to_string+0x43e/0x8c0 security/selinux/ss/services.c:1238 context_add_hash+0x13f/0x270 security/selinux/ss/services.c:1479 context_struct_to_sid security/selinux/ss/services.c:1497 [inline] security_compute_sid+0x1153/0x1d00 security/selinux/ss/services.c:1861 security_transition_sid+0x78/0x90 security/selinux/ss/services.c:1886 socket_sockcreate_sid security/selinux/hooks.c:4558 [inline] selinux_socket_post_create+0x375/0x500 security/selinux/hooks.c:4611 security_socket_post_create+0x6f/0xd0 security/security.c:2002 __sock_create+0x42e/0x730 net/socket.c:1424 sock_create net/socket.c:1459 [inline] __sys_socketpair+0x309/0x6e0 net/socket.c:1563 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_pcp_prepare+0x1a4/0x290 mm/page_alloc.c:1233 free_unref_page_prepare mm/page_alloc.c:3085 [inline] free_unref_page_list+0x11e/0x6e0 mm/page_alloc.c:3154 release_pages+0xa46/0xa80 mm/swap.c:842 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:184 [inline] tlb_flush_mmu+0x77f/0x910 mm/mmu_gather.c:191 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:272 exit_mmap+0x2e8/0x540 mm/mmap.c:3188 __mmput+0x34/0x240 kernel/fork.c:1090 exit_mm kernel/exit.c:489 [inline] do_exit+0xc44/0x2d30 kernel/exit.c:799 do_group_exit+0x136/0x300 kernel/exit.c:910 get_signal+0xd99/0x13f0 kernel/signal.c:2735 do_signal+0xb0/0x1200 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xdd/0x1d0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x17c/0x1d0 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Memory state around the buggy address: ffff8881e456f000: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8881e456f080: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc >ffff8881e456f100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8881e456f180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8881e456f200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ================================================================== EXT4-fs error (device loop3): ext4_read_block_bitmap_nowait:430: comm syz-executor.3: Invalid block bitmap block 0 in block_group 0