================================================================== BUG: KASAN: slab-out-of-bounds in ext4_search_dir+0xf8/0x1c0 fs/ext4/namei.c:1516 Read of size 1 at addr ffff888119c90c86 by task syz.2.17/531 CPU: 1 PID: 531 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 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+0x100/0x140 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_search_dir+0xf8/0x1c0 fs/ext4/namei.c:1516 ext4_find_inline_entry+0x4f2/0x630 fs/ext4/inline.c:1738 __ext4_find_entry+0x2fa/0x1930 fs/ext4/namei.c:1589 ext4_lookup_entry fs/ext4/namei.c:1746 [inline] ext4_lookup+0x305/0x8c0 fs/ext4/namei.c:1814 __lookup_hash+0x114/0x250 fs/namei.c:1549 filename_create+0x1d7/0x680 fs/namei.c:3658 user_path_create fs/namei.c:3715 [inline] do_mkdirat+0x5e/0x340 fs/namei.c:3855 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f2e0f93ecc7 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2e0f7a1e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f2e0f7a1ee0 RCX: 00007f2e0f93ecc7 RDX: 00000000000001ff RSI: 0000200000000080 RDI: 00000000ffffff9c RBP: 0000200000000140 R08: 0000200000000080 R09: 0000000000000000 R10: 0000200000000140 R11: 0000000000000246 R12: 0000200000000080 R13: 00007f2e0f7a1ea0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 0: (stack is not available) Freed by task 526: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 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:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x53b/0x690 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] consume_skb+0xab/0x1f0 net/core/skbuff.c:855 netlink_broadcast_filtered+0x11ce/0x12c0 net/netlink/af_netlink.c:1535 netlink_broadcast net/netlink/af_netlink.c:1557 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0xe9/0x1a0 net/netlink/af_netlink.c:2551 rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:740 rtmsg_fib+0x259/0x3a0 net/ipv4/fib_semantics.c:570 fib_table_insert+0xee7/0x1d60 net/ipv4/fib_trie.c:1335 fib_magic net/ipv4/fib_frontend.c:1107 [inline] fib_add_ifaddr+0x892/0xf90 net/ipv4/fib_frontend.c:1144 fib_netdev_event+0x22e/0x5b0 net/ipv4/fib_frontend.c:1491 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:2052 [inline] call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] __dev_notify_flags+0x2f4/0x5b0 net/core/dev.c:8583 dev_change_flags+0xe3/0x1a0 net/core/dev.c:8621 do_setlink+0xb19/0x29a0 net/core/rtnetlink.c:2744 __rtnl_newlink net/core/rtnetlink.c:3422 [inline] rtnl_newlink+0x13e6/0x1830 net/core/rtnetlink.c:3542 rtnetlink_rcv_msg+0x9e9/0xca0 net/core/rtnetlink.c:5622 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5640 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x467/0x620 net/socket.c:2007 __do_sys_sendto net/socket.c:2019 [inline] __se_sys_sendto net/socket.c:2015 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2015 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 ffff888119c90800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 134 bytes to the right of 1024-byte region [ffff888119c90800, ffff888119c90c00) The buggy address belongs to the page: page:ffffea0004672400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119c90 head:ffffea0004672400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 raw: 0000000000000000 0000000000100010 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7, ts 44626841917, free_ts 44586871870 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 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+0x2f8/0x4c0 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+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_rt_notify+0x293/0x480 net/ipv6/route.c:6056 fib6_del_route net/ipv6/ip6_fib.c:1993 [inline] fib6_del+0xb9e/0xf00 net/ipv6/ip6_fib.c:2028 fib6_clean_node+0x2a1/0x540 net/ipv6/ip6_fib.c:2190 fib6_walk_continue+0x54b/0x740 net/ipv6/ip6_fib.c:2112 fib6_walk+0x153/0x290 net/ipv6/ip6_fib.c:2160 fib6_clean_tree net/ipv6/ip6_fib.c:2240 [inline] __fib6_clean_all net/ipv6/ip6_fib.c:2256 [inline] fib6_clean_all+0x1a1/0x270 net/ipv6/ip6_fib.c:2267 rt6_sync_down_dev net/ipv6/route.c:4793 [inline] rt6_disable_ip+0x12a/0x7a0 net/ipv6/route.c:4798 addrconf_ifdown+0x144/0x1890 net/ipv6/addrconf.c:3794 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_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x390 mm/page_alloc.c:5454 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab mm/slub.c:1920 [inline] unfreeze_partials+0x150/0x180 mm/slub.c:2415 put_cpu_partial+0xc1/0x180 mm/slub.c:2451 __slab_free+0x2c9/0x3a0 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x10e/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965 sock_alloc_inode+0x1b/0xb0 net/socket.c:253 alloc_inode fs/inode.c:233 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:968 sock_alloc net/socket.c:574 [inline] __sock_create+0x12c/0x770 net/socket.c:1401 Memory state around the buggy address: ffff888119c90b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888119c90c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888119c90c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888119c90d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888119c90d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================