EXT4-fs error (device loop0): ext4_xattr_inode_iget:404: comm syz-executor: inode #4263244710: comm syz-executor: iget: illegal inode #
EXT4-fs error (device loop0): ext4_xattr_inode_iget:409: comm syz-executor: error while reading EA inode 4263244710 err=-117
==================================================================
BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0xd04/0xfa0 fs/ext4/xattr.c:1134
Read of size 4 at addr ffff88810df740b0 by task syz-executor/511

CPU: 0 PID: 511 Comm: syz-executor Not tainted 5.10.236-syzkaller-1007360-gba8b8b193394 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 ext4_xattr_inode_dec_ref_all+0xd04/0xfa0 fs/ext4/xattr.c:1134
 ext4_xattr_delete_inode+0xaa6/0xc80 fs/ext4/xattr.c:2901
 ext4_evict_inode+0x1095/0x1730 fs/ext4/inode.c:300
 evict+0x526/0x9c0 fs/inode.c:612
 iput_final fs/inode.c:1736 [inline]
 iput+0x632/0x7e0 fs/inode.c:1762
 do_unlinkat+0x48e/0x8b0 fs/namei.c:4042
 __do_sys_unlink fs/namei.c:4082 [inline]
 __se_sys_unlink fs/namei.c:4080 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4080
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f3eaa81f717
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd8a83eb48 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3eaa81f717
RDX: 00007ffd8a83eb70 RSI: 00007ffd8a83ec00 RDI: 00007ffd8a83ec00
RBP: 00007ffd8a83ec00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd8a83fcf0
R13: 00007f3eaa8a108c R14: 000000000000da96 R15: 00007ffd8a840dc0

Allocated by task 365:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 vm_area_dup+0x26/0x270 kernel/fork.c:366
 __split_vma+0xbd/0x420 mm/mmap.c:2860
 __do_munmap+0x39a/0x8c0 mm/mmap.c:2977
 __vm_munmap mm/mmap.c:3082 [inline]
 vm_munmap+0x11c/0x1a0 mm/mmap.c:3100
 elf_map+0x210/0x240 fs/binfmt_elf.c:390
 load_elf_binary+0xfe0/0x2750 fs/binfmt_elf.c:1141
 search_binary_handler fs/exec.c:1726 [inline]
 exec_binprm fs/exec.c:1767 [inline]
 bprm_execve+0x81b/0x1600 fs/exec.c:1843
 do_execveat_common+0x959/0xac0 fs/exec.c:1954
 do_execve fs/exec.c:2024 [inline]
 __do_sys_execve fs/exec.c:2100 [inline]
 __se_sys_execve fs/exec.c:2095 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2095
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 365:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kmem_cache_free+0xa9/0x1e0 mm/slub.c:3219
 vm_area_free+0x52/0xf0 kernel/fork.c:386
 __free_vma mm/mmap.c:179 [inline]
 put_vma mm/mmap.c:186 [inline]
 remove_vma mm/mmap.c:204 [inline]
 remove_vma_list+0x2f2/0x380 mm/mmap.c:2758
 __do_munmap+0x6a4/0x8c0 mm/mmap.c:3032
 __vm_munmap mm/mmap.c:3082 [inline]
 vm_munmap+0x11c/0x1a0 mm/mmap.c:3100
 elf_map+0x210/0x240 fs/binfmt_elf.c:390
 load_elf_binary+0xfe0/0x2750 fs/binfmt_elf.c:1141
 search_binary_handler fs/exec.c:1726 [inline]
 exec_binprm fs/exec.c:1767 [inline]
 bprm_execve+0x81b/0x1600 fs/exec.c:1843
 do_execveat_common+0x959/0xac0 fs/exec.c:1954
 do_execve fs/exec.c:2024 [inline]
 __do_sys_execve fs/exec.c:2100 [inline]
 __se_sys_execve fs/exec.c:2095 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2095
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff88810df74000
 which belongs to the cache vm_area_struct of size 232
The buggy address is located 176 bytes inside of
 232-byte region [ffff88810df74000, ffff88810df740e8)
The buggy address belongs to the page:
page:ffffea000437dd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10df74
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100188d80
raw: 0000000000000000 00000000000d000d 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 96, ts 4703456521, free_ts 4699860901
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5349
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960
 vm_area_dup+0x26/0x270 kernel/fork.c:366
 __split_vma+0xbd/0x420 mm/mmap.c:2860
 __do_munmap+0x39a/0x8c0 mm/mmap.c:2977
 do_munmap mm/mmap.c:3040 [inline]
 munmap_vma_range mm/mmap.c:638 [inline]
 __mmap_region mm/mmap.c:1822 [inline]
 mmap_region+0xa31/0x1cd0 mm/mmap.c:3063
 do_mmap+0x800/0xeb0 mm/mmap.c:1649
 vm_mmap_pgoff+0x201/0x390 mm/util.c:543
 ksys_mmap_pgoff+0x16f/0x1f0 mm/mmap.c:1700
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline]
 __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443
 release_pages+0xea0/0xef0 mm/swap.c:1103
 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:356
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:326
 exit_mmap+0x306/0x560 mm/mmap.c:3375
 __mmput+0x95/0x2d0 kernel/fork.c:1153
 mmput+0x59/0x170 kernel/fork.c:1176
 exec_mmap fs/exec.c:1040 [inline]
 begin_new_exec+0xb8d/0x2380 fs/exec.c:1287
 load_elf_binary+0x945/0x2750 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1726 [inline]
 exec_binprm fs/exec.c:1767 [inline]
 bprm_execve+0x81b/0x1600 fs/exec.c:1843
 do_execveat_common+0x959/0xac0 fs/exec.c:1954
 do_execve fs/exec.c:2024 [inline]
 __do_sys_execve fs/exec.c:2100 [inline]
 __se_sys_execve fs/exec.c:2095 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2095
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff88810df73f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810df74000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810df74080: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
                                     ^
 ffff88810df74100: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
 ffff88810df74180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================