EXT4-fs (loop0): Ignoring removed orlov option EXT4-fs (loop0): mounted filesystem without journal. Opts: noblock_validity,bsddf,sysvgroups,norecovery,debug_want_extra_isize=0x0000000000000080,orlov,nogrpid,noauto_da_alloc,acl,,errors=continue ================================================================== BUG: KASAN: slab-out-of-bounds in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1516 Read of size 1 at addr ffff8881128af900 by task syz.0.24/429 CPU: 0 PID: 429 Comm: syz.0.24 Not tainted 5.10.226-syzkaller-00709-ge5e5644ea27f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1516 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1700 __ext4_find_entry+0x2b0/0x1990 fs/ext4/namei.c:1589 ext4_lookup_entry fs/ext4/namei.c:1744 [inline] ext4_lookup+0x3c6/0xaa0 fs/ext4/namei.c:1812 __lookup_hash+0x143/0x290 fs/namei.c:1541 filename_create+0x202/0x750 fs/namei.c:3608 user_path_create fs/namei.c:3665 [inline] do_mknodat+0x187/0x450 fs/namei.c:3729 __do_sys_mknod fs/namei.c:3768 [inline] __se_sys_mknod fs/namei.c:3766 [inline] __x64_sys_mknod+0x80/0x90 fs/namei.c:3766 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f676e566ff9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb0046c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00007f676e71ef80 RCX: 00007f676e566ff9 RDX: 0000000000000701 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 00007f676e5d9296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f676e71ef80 R14: 00007f676e71ef80 R15: 0000000000000ac5 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff8881128af900 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff8881128af900, ffff8881128af960) The buggy address belongs to the page: page:ffffea00044a2bc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1128af flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100043680 raw: 0000000000000000 0000000080200020 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), pid 0, ts 26775772889, free_ts 26756109211 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:5348 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_trace+0x1bd/0x2e0 mm/slub.c:2972 kmalloc include/linux/slab.h:552 [inline] dst_cow_metrics_generic+0x55/0x1c0 net/core/dst.c:201 dst_metrics_write_ptr include/net/dst.h:117 [inline] dst_metric_set include/net/dst.h:178 [inline] icmp6_dst_alloc+0x385/0x560 net/ipv6/route.c:3177 mld_sendpack+0x4d8/0xb40 net/ipv6/mcast.c:1665 mld_send_cr net/ipv6/mcast.c:1972 [inline] mld_ifc_timer_expire+0x816/0xbf0 net/ipv6/mcast.c:2471 call_timer_fn+0x3b/0x2d0 kernel/time/timer.c:1450 expire_timers kernel/time/timer.c:1495 [inline] __run_timers+0x72a/0xa10 kernel/time/timer.c:1789 run_timer_softirq+0x69/0xf0 kernel/time/timer.c:1802 __do_softirq+0x268/0x5bb kernel/softirq.c:309 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 mm/page_alloc.c:3391 [inline] free_the_page+0x9e/0x370 mm/page_alloc.c:5407 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 free_pages+0x7c/0x90 mm/page_alloc.c:5429 tlb_batch_list_free mm/mmu_gather.c:61 [inline] tlb_finish_mmu+0x253/0x320 mm/mmu_gather.c:329 unmap_region+0x31c/0x370 mm/mmap.c:2810 __do_munmap+0x699/0x8c0 mm/mmap.c:3041 __vm_munmap mm/mmap.c:3064 [inline] __do_sys_munmap mm/mmap.c:3090 [inline] __se_sys_munmap+0x120/0x1a0 mm/mmap.c:3086 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3086 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff8881128af800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881128af880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881128af900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881128af980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881128afa00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop0): ext4_find_dest_de:2077: inode #12: block 7: comm syz.0.24: bad entry in directory: directory entry overrun - offset=0, inode=1793120026, rec_len=34652, size=56 fake=0