================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline] BUG: KASAN: use-after-free in ext4_inlinedir_to_tree+0x503/0xfb0 fs/ext4/inline.c:1412 Read of size 68 at addr ffff88810b869719 by task syz-executor151/337 CPU: 0 PID: 337 Comm: syz-executor151 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:210 [inline] ext4_inlinedir_to_tree+0x503/0xfb0 fs/ext4/inline.c:1412 ext4_htree_fill_tree+0x516/0x10e0 fs/ext4/namei.c:1211 ext4_dx_readdir fs/ext4/dir.c:608 [inline] ext4_readdir+0x2d9f/0x3c10 fs/ext4/dir.c:145 iterate_dir+0x26d/0x610 fs/readdir.c:-1 __do_sys_getdents fs/readdir.c:286 [inline] __se_sys_getdents+0xf2/0x250 fs/readdir.c:271 __x64_sys_getdents+0x7b/0x90 fs/readdir.c:271 x64_sys_call+0x212/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:79 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4d43d89859 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff68c09d48 EFLAGS: 00000246 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4d43d89859 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f4d43de4432 R10: 0000000000000006 R11: 0000000000000246 R12: 00007f4d43de4432 R13: 0000000000000000 R14: 431bde82d7b634db R15: 00007fff68c09db0 Allocated by task 302: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x72/0x80 mm/kasan/common.c:334 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3382 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x166/0x320 mm/slub.c:3408 skb_clone+0x1e8/0x380 net/core/skbuff.c:1663 dev_queue_xmit_nit+0x245/0xab0 net/core/dev.c:2342 xmit_one net/core/dev.c:3699 [inline] dev_hard_start_xmit+0x15f/0x730 net/core/dev.c:3722 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3943 [inline] __dev_queue_xmit+0x163e/0x3540 net/core/dev.c:4348 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_hh_output include/net/neighbour.h:536 [inline] neigh_output include/net/neighbour.h:550 [inline] ip_finish_output2+0xc07/0xf50 net/ipv4/ip_output.c:228 __ip_finish_output+0x172/0x370 net/ipv4/ip_output.c:-1 ip_finish_output+0x31/0x2b0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x1ea/0x390 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:453 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x1129/0x1cf0 net/ipv4/ip_output.c:538 ip_queue_xmit+0x4d/0x70 net/ipv4/ip_output.c:552 __tcp_transmit_skb+0x1da6/0x3410 net/ipv4/tcp_output.c:1406 tcp_transmit_skb net/ipv4/tcp_output.c:1424 [inline] tcp_write_xmit+0x17e1/0x5e20 net/ipv4/tcp_output.c:2721 __tcp_push_pending_frames+0x99/0x2f0 net/ipv4/tcp_output.c:2906 tcp_push_pending_frames include/net/tcp.h:1987 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5605 [inline] tcp_rcv_established+0xe2b/0x1ab0 net/ipv4/tcp_input.c:6029 tcp_v4_do_rcv+0x446/0x9c0 net/ipv4/tcp_ipv4.c:1684 sk_backlog_rcv include/net/sock.h:1150 [inline] __release_sock+0x154/0x380 net/core/sock.c:2951 release_sock+0x60/0x1c0 net/core/sock.c:3527 tcp_sendmsg+0x39/0x50 net/ipv4/tcp.c:1493 inet_sendmsg+0xb6/0xd0 net/ipv4/af_inet.c:841 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] sock_write_iter+0x2ea/0x3f0 net/socket.c:1133 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 302: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1750 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776 slab_free mm/slub.c:3712 [inline] kmem_cache_free+0x12d/0x300 mm/slub.c:3737 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1 __kfree_skb net/core/skbuff.c:874 [inline] consume_skb+0xb3/0x1f0 net/core/skbuff.c:1038 packet_rcv+0x16d/0x1510 net/packet/af_packet.c:2280 dev_queue_xmit_nit+0xa27/0xab0 net/core/dev.c:2374 xmit_one net/core/dev.c:3699 [inline] dev_hard_start_xmit+0x15f/0x730 net/core/dev.c:3722 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3943 [inline] __dev_queue_xmit+0x163e/0x3540 net/core/dev.c:4348 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_hh_output include/net/neighbour.h:536 [inline] neigh_output include/net/neighbour.h:550 [inline] ip_finish_output2+0xc07/0xf50 net/ipv4/ip_output.c:228 __ip_finish_output+0x172/0x370 net/ipv4/ip_output.c:-1 ip_finish_output+0x31/0x2b0 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip_output+0x1ea/0x390 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:453 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x1129/0x1cf0 net/ipv4/ip_output.c:538 ip_queue_xmit+0x4d/0x70 net/ipv4/ip_output.c:552 __tcp_transmit_skb+0x1da6/0x3410 net/ipv4/tcp_output.c:1406 tcp_transmit_skb net/ipv4/tcp_output.c:1424 [inline] tcp_write_xmit+0x17e1/0x5e20 net/ipv4/tcp_output.c:2721 __tcp_push_pending_frames+0x99/0x2f0 net/ipv4/tcp_output.c:2906 tcp_push_pending_frames include/net/tcp.h:1987 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5605 [inline] tcp_rcv_established+0xe2b/0x1ab0 net/ipv4/tcp_input.c:6029 tcp_v4_do_rcv+0x446/0x9c0 net/ipv4/tcp_ipv4.c:1684 sk_backlog_rcv include/net/sock.h:1150 [inline] __release_sock+0x154/0x380 net/core/sock.c:2951 release_sock+0x60/0x1c0 net/core/sock.c:3527 tcp_sendmsg+0x39/0x50 net/ipv4/tcp.c:1493 inet_sendmsg+0xb6/0xd0 net/ipv4/af_inet.c:841 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] sock_write_iter+0x2ea/0x3f0 net/socket.c:1133 call_write_iter include/linux/fs.h:2282 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x5ef/0xd00 fs/read_write.c:584 ksys_write+0x14a/0x260 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:646 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88810b869640 which belongs to the cache skbuff_head_cache of size 256 The buggy address is located 217 bytes inside of 256-byte region [ffff88810b869640, ffff88810b869740) The buggy address belongs to the physical page: page:ffffea00042e1a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b869 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff888108854a80 raw: 0000000000000000 00000000000c000c 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 302, tgid 302 (sshd-session), ts 23540349894, free_ts 23540123810 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3e0 mm/slub.c:2020 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] slab_alloc mm/slub.c:3392 [inline] __kmem_cache_alloc_lru mm/slub.c:3399 [inline] kmem_cache_alloc+0x1a8/0x320 mm/slub.c:3408 skb_clone+0x1e8/0x380 net/core/skbuff.c:1663 dev_queue_xmit_nit+0x245/0xab0 net/core/dev.c:2342 xmit_one net/core/dev.c:3699 [inline] dev_hard_start_xmit+0x15f/0x730 net/core/dev.c:3722 sch_direct_xmit+0x279/0x9c0 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3943 [inline] __dev_queue_xmit+0x163e/0x3540 net/core/dev.c:4348 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_hh_output include/net/neighbour.h:536 [inline] neigh_output include/net/neighbour.h:550 [inline] ip_finish_output2+0xc07/0xf50 net/ipv4/ip_output.c:228 __ip_finish_output+0x172/0x370 net/ipv4/ip_output.c:-1 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1580 [inline] free_pcp_prepare mm/page_alloc.c:1654 [inline] free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621 free_unref_page+0x93/0x530 mm/page_alloc.c:3719 free_the_page+0x13/0x20 mm/page_alloc.c:863 page_frag_free+0x10a/0x120 mm/page_alloc.c:6159 skb_free_frag include/linux/skbuff.h:3315 [inline] skb_free_head net/core/skbuff.c:763 [inline] skb_release_data+0x70d/0x8a0 net/core/skbuff.c:794 skb_release_all net/core/skbuff.c:859 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:873 tcp_rcv_established+0xdc1/0x1ab0 net/ipv4/tcp_input.c:6028 tcp_v4_do_rcv+0x446/0x9c0 net/ipv4/tcp_ipv4.c:1684 tcp_v4_rcv+0x239f/0x2ae0 net/ipv4/tcp_ipv4.c:2115 ip_protocol_deliver_rcu+0x371/0x780 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x23e/0x400 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x1dc/0x350 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:463 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline] ip_sublist_rcv+0x787/0x8d0 net/ipv4/ip_input.c:639 ip_list_rcv+0x3e4/0x430 net/ipv4/ip_input.c:674 __netif_receive_skb_list_ptype net/core/dev.c:5678 [inline] __netif_receive_skb_list_core+0x5a8/0x7b0 net/core/dev.c:5726 __netif_receive_skb_list net/core/dev.c:5778 [inline] netif_receive_skb_list_internal+0x7f8/0xaa0 net/core/dev.c:5869 Memory state around the buggy address: ffff88810b869600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88810b869680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810b869700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88810b869780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810b869800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop2): ext4_inlinedir_to_tree:1450: inode #12: block 7: comm syz-executor151: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=35245, inode=1221132332, rec_len=35241, size=128 fake=0