================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1066/0x10d0 fs/ext4/namei.c:1221 Read of size 1 at addr ffff888110b4ba67 by task syz-executor/467 CPU: 0 PID: 467 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_htree_fill_tree+0x1066/0x10d0 fs/ext4/namei.c:1221 ext4_dx_readdir fs/ext4/dir.c:601 [inline] ext4_readdir+0x2b45/0x39b0 fs/ext4/dir.c:145 iterate_dir+0x260/0x570 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xe5/0x240 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7ff61bbf0bf3 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 f2 44 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffe9ed68928 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555588ba84e0 RCX: 00007ff61bbf0bf3 RDX: 0000000000008000 RSI: 0000555588ba84e0 RDI: 0000000000000005 RBP: 0000555588ba84b4 R08: 0000000000028b61 R09: 0000000000000000 R10: 00007ff61bd1dca0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 0000555588ba84b0 R15: 000000000000a745 Allocated by task 0: (stack is not available) The buggy address belongs to the object at ffff888110b4a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2663 bytes to the right of 4096-byte region [ffff888110b4a000, ffff888110b4b000) The buggy address belongs to the page: page:ffffea000442d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110b48 head:ffffea000442d200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042c00 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 457, ts 42432723412, free_ts 42408410402 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1ef/0x320 mm/slub.c:4541 kmemdup+0x26/0x60 mm/util.c:131 __devinet_sysctl_register+0xad/0x390 net/ipv4/devinet.c:2586 devinet_sysctl_register+0x169/0x1e0 net/ipv4/devinet.c:2638 inetdev_init+0x273/0x480 net/ipv4/devinet.c:277 inetdev_event+0x1f8/0x1030 net/ipv4/devinet.c:1544 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers+0x111/0x190 net/core/dev.c:2080 register_netdevice+0x1043/0x13c0 net/core/dev.c:10087 __ip_tunnel_create+0x2bf/0x380 net/ipv4/ip_tunnel.c:267 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+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page mm/page_alloc.c:5429 [inline] __free_pages+0x14b/0x380 mm/page_alloc.c:5440 free_pages+0x82/0x90 mm/page_alloc.c:5451 kasan_depopulate_vmalloc_pte+0x6b/0x90 mm/kasan/shadow.c:354 apply_to_pte_range mm/memory.c:2504 [inline] apply_to_pmd_range mm/memory.c:2540 [inline] apply_to_pud_range mm/memory.c:2568 [inline] apply_to_p4d_range mm/memory.c:2596 [inline] __apply_to_page_range+0x74e/0x9e0 mm/memory.c:2623 apply_to_existing_page_range+0x38/0x50 mm/memory.c:2874 kasan_release_vmalloc+0x97/0xb0 mm/kasan/shadow.c:464 __purge_vmap_area_lazy+0x133b/0x1470 mm/vmalloc.c:1382 _vm_unmap_aliases+0x2f8/0x380 mm/vmalloc.c:1779 vm_unmap_aliases+0x19/0x20 mm/vmalloc.c:1802 change_page_attr_set_clr+0x311/0xc10 arch/x86/mm/pat/set_memory.c:1732 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1789 [inline] set_memory_ro+0x89/0xd0 arch/x86/mm/pat/set_memory.c:1935 bpf_jit_binary_lock_ro include/linux/filter.h:846 [inline] bpf_int_jit_compile+0x860b/0x8ae0 arch/x86/net/bpf_jit_comp.c:2134 bpf_prog_select_runtime+0x742/0x9e0 kernel/bpf/core.c:1876 bpf_migrate_filter net/core/filter.c:1306 [inline] bpf_prepare_filter+0xed9/0x1080 net/core/filter.c:1354 bpf_prog_create_from_user+0x2c7/0x410 net/core/filter.c:1448 Memory state around the buggy address: ffff888110b4b900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888110b4b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888110b4ba00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888110b4ba80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888110b4bb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================