[syzbot] [net?] memory leak in vlan_vid_add
From: syzbot <hidden>
Date: 2026-07-07 08:20:27
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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 --- This report is generated by a bot. 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