================================================================== BUG: KASAN: slab-out-of-bounds in check_igot_inode+0x187/0x1b0 fs/ext4/inode.c:4622 Read of size 8 at addr ffff888070fb7f30 by task syz-executor.3/26148 CPU: 0 PID: 26148 Comm: syz-executor.3 Not tainted 6.5.0-rc5-syzkaller-00053-g13b937206866 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 check_igot_inode+0x187/0x1b0 fs/ext4/inode.c:4622 __ext4_iget+0x14fc/0x43b0 fs/ext4/inode.c:4674 __ext4_fill_super fs/ext4/super.c:5467 [inline] ext4_fill_super+0x64c9/0xaf30 fs/ext4/super.c:5696 get_tree_bdev+0x43e/0x7d0 fs/super.c:1318 vfs_get_tree+0x88/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x291/0x310 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7fc2579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7fbd3f0 EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f7fbd460 RCX: 0000000020000200 RDX: 00000000200001c0 RSI: 0000000003000480 RDI: 00000000f7fbd4a0 RBP: 00000000200001c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 26121: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x172/0x3b0 mm/slub.c:3494 kmem_cache_zalloc include/linux/slab.h:693 [inline] alloc_buffer_head+0x21/0x140 fs/buffer.c:3037 folio_alloc_buffers+0x2ad/0x800 fs/buffer.c:940 folio_create_empty_buffers+0x36/0x470 fs/buffer.c:1669 ext4_block_write_begin+0xc08/0xe30 fs/ext4/inode.c:1024 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2892 generic_perform_write+0x278/0x600 mm/filemap.c:3923 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7ee/0x1950 fs/ext4/file.c:722 call_write_iter include/linux/fs.h:1877 [inline] do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735 do_iter_write+0x17f/0x830 fs/read_write.c:860 vfs_iter_write+0x7a/0xb0 fs/read_write.c:901 iter_file_splice_write+0x698/0xbf0 fs/splice.c:739 do_splice_from fs/splice.c:936 [inline] direct_splice_actor+0x118/0x180 fs/splice.c:1145 splice_direct_to_actor+0x347/0xa30 fs/splice.c:1091 do_splice_direct+0x1af/0x280 fs/splice.c:1197 do_sendfile+0xb88/0x1390 fs/read_write.c:1254 __do_compat_sys_sendfile fs/read_write.c:1343 [inline] __se_compat_sys_sendfile fs/read_write.c:1326 [inline] __ia32_compat_sys_sendfile+0x1e3/0x220 fs/read_write.c:1326 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff888070fb7e80 which belongs to the cache buffer_head of size 168 The buggy address is located 8 bytes to the right of allocated 168-byte region [ffff888070fb7e80, ffff888070fb7f28) The buggy address belongs to the physical page: page:ffffea0001c3edc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x70fb7 memcg:ffff888058f43101 flags: 0x4fff00000000200(slab|node=1|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 04fff00000000200 ffff8880136c2780 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000110011 00000001ffffffff ffff888058f43101 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 26121, tgid 26119 (syz-executor.1), ts 592729209775, free_ts 574968036983 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2292 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x24e/0x380 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x392/0x3b0 mm/slub.c:3494 kmem_cache_zalloc include/linux/slab.h:693 [inline] alloc_buffer_head+0x21/0x140 fs/buffer.c:3037 folio_alloc_buffers+0x2ad/0x800 fs/buffer.c:940 folio_create_empty_buffers+0x36/0x470 fs/buffer.c:1669 ext4_block_write_begin+0xc08/0xe30 fs/ext4/inode.c:1024 ext4_da_write_begin+0x40a/0x8c0 fs/ext4/inode.c:2892 generic_perform_write+0x278/0x600 mm/filemap.c:3923 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7ee/0x1950 fs/ext4/file.c:722 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443 __unfreeze_partials+0x21d/0x240 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18b/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x172/0x3b0 mm/slub.c:3494 getname_flags.part.0+0x50/0x4d0 fs/namei.c:140 getname_flags include/linux/audit.h:319 [inline] getname+0x90/0xe0 fs/namei.c:219 do_sys_openat2+0x100/0x1e0 fs/open.c:1401 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888070fb7e00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888070fb7e80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888070fb7f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ^ ffff888070fb7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888070fb8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi