[syzbot] [net?] memory leak in vlan_vid_add

[syzbot <syzbot+456957213f32970c0762@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    71dfdfb0209b Merge tag 'vfs-7.2-rc2.fixes' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13bbf1b1580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b80376788da8bcda
dashboard link: https://syzkaller.appspot.com/bug?extid=456957213f32970c0762
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10166ffe580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16218b1c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d3c154e8d39b/disk-71dfdfb0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9f35a0982146/vmlinux-71dfdfb0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/fc56d29c15a3/bzImage-71dfdfb0.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+456957213f32970c0762@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff8881147f3c00 (size 256):
  comm "syz-executor", pid 5805, jiffies 4294943736
  hex dump (first 32 bytes):
    00 40 02 0b 81 88 ff ff 00 00 00 00 00 00 00 00  .@..............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc a66a6b91):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4625 [inline]
    slab_alloc_node mm/slub.c:4945 [inline]
    __kmalloc_cache_noprof+0x356/0x440 mm/slub.c:5511
    _kmalloc_noprof include/linux/slab.h:969 [inline]
    _kzalloc_noprof include/linux/slab.h:1290 [inline]
    vlan_info_alloc net/8021q/vlan_core.c:153 [inline]
    vlan_vid_add+0x1ff/0x2b0 net/8021q/vlan_core.c:329
    vlan_vid0_add net/8021q/vlan.c:349 [inline]
    vlan_device_event.cold+0x27/0x65 net/8021q/vlan.c:388
    notifier_call_chain+0x59/0x160 kernel/notifier.c:85
    call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250
    call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
    call_netdevice_notifiers net/core/dev.c:2302 [inline]
    __dev_notify_flags+0xb1/0x1b0 net/core/dev.c:9793
    netif_change_flags+0x71/0x90 net/core/dev.c:9822
    do_setlink.isra.0+0x50e/0x1ce0 net/core/rtnetlink.c:3215
    rtnl_changelink net/core/rtnetlink.c:3849 [inline]
    __rtnl_newlink net/core/rtnetlink.c:4022 [inline]
    rtnl_newlink+0xb23/0x1310 net/core/rtnetlink.c:4159
    rtnetlink_rcv_msg+0x52b/0x600 net/core/rtnetlink.c:7076
    netlink_rcv_skb+0x89/0x1c0 net/netlink/af_netlink.c:2556
    netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
    netlink_unicast+0x38f/0x4e0 net/netlink/af_netlink.c:1345
    netlink_sendmsg+0x335/0x690 net/netlink/af_netlink.c:1900
    sock_sendmsg_nosec net/socket.c:775 [inline]
    __sock_sendmsg net/socket.c:790 [inline]
    __sys_sendto+0x2ca/0x2e0 net/socket.c:2252
    __do_sys_sendto net/socket.c:2259 [inline]
    __se_sys_sendto net/socket.c:2255 [inline]
    __x64_sys_sendto+0x28/0x30 net/socket.c:2255
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xf8/0x610 arch/x86/entry/syscall_64.c:94

BUG: memory leak
unreferenced object 0xffff8881127a3660 (size 32):
  comm "syz-executor", pid 5805, jiffies 4294943736
  hex dump (first 32 bytes):
    a0 3c 7f 14 81 88 ff ff a0 3c 7f 14 81 88 ff ff  .<.......<......
    81 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc a6a88710):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4625 [inline]
    slab_alloc_node mm/slub.c:4945 [inline]
    __kmalloc_cache_noprof+0x356/0x440 mm/slub.c:5511
    _kmalloc_noprof include/linux/slab.h:969 [inline]
    _kzalloc_noprof include/linux/slab.h:1290 [inline]
    vlan_vid_info_alloc net/8021q/vlan_core.c:196 [inline]
    __vlan_vid_add net/8021q/vlan_core.c:302 [inline]
    vlan_vid_add+0x14f/0x2b0 net/8021q/vlan_core.c:336
    vlan_vid0_add net/8021q/vlan.c:349 [inline]
    vlan_device_event.cold+0x27/0x65 net/8021q/vlan.c:388
    notifier_call_chain+0x59/0x160 kernel/notifier.c:85
    call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250
    call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
    call_netdevice_notifiers net/core/dev.c:2302 [inline]
    __dev_notify_flags+0xb1/0x1b0 net/core/dev.c:9793
    netif_change_flags+0x71/0x90 net/core/dev.c:9822
    do_setlink.isra.0+0x50e/0x1ce0 net/core/rtnetlink.c:3215
    rtnl_changelink net/core/rtnetlink.c:3849 [inline]
    __rtnl_newlink net/core/rtnetlink.c:4022 [inline]
    rtnl_newlink+0xb23/0x1310 net/core/rtnetlink.c:4159
    rtnetlink_rcv_msg+0x52b/0x600 net/core/rtnetlink.c:7076
    netlink_rcv_skb+0x89/0x1c0 net/netlink/af_netlink.c:2556
    netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
    netlink_unicast+0x38f/0x4e0 net/netlink/af_netlink.c:1345
    netlink_sendmsg+0x335/0x690 net/netlink/af_netlink.c:1900
    sock_sendmsg_nosec net/socket.c:775 [inline]
    __sock_sendmsg net/socket.c:790 [inline]
    __sys_sendto+0x2ca/0x2e0 net/socket.c:2252
    __do_sys_sendto net/socket.c:2259 [inline]
    __se_sys_sendto net/socket.c:2255 [inline]
    __x64_sys_sendto+0x28/0x30 net/socket.c:2255
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xf8/0x610 arch/x86/entry/syscall_64.c:94

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


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