CVE-2022-49636

In the Linux kernel, the following vulnerability has been resolved: vlan: fix memory leak in vlan_newlink() Blamed commit added back a bug I fixed in commit 9bbd917e0bec ("vlan: fix memory leak in vlan_dev_set_egress_priority") If a memory allocation fails in vlan_changelink() after other allocations succeeded, we need to call vlan_dev_free_egress_priority() to free all allocated memory because after a failed ->newlink() we do not call any methods like ndo_uninit() or dev->priv_destructor(). In following example, if the allocation for last element 2000:2001 fails, we need to free eight prior allocations: ip link add link dummy0 dummy0.100 type vlan id 100 \ egress-qos-map 1:2 2:3 3:4 4:5 5:6 6:7 7:8 8:9 2000:2001 syzbot report was: BUG: memory leak unreferenced object 0xffff888117bd1060 (size 32): comm "syz-executor408", pid 3759, jiffies 4294956555 (age 34.090s) hex dump (first 32 bytes): 09 00 00 00 00 a0 00 00 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: [ ] kmalloc include/linux/slab.h:600 [inline] [ ] vlan_dev_set_egress_priority+0xed/0x170 net/8021q/vlan_dev.c:193 [ ] vlan_changelink+0x178/0x1d0 net/8021q/vlan_netlink.c:128 [ ] vlan_newlink+0x148/0x260 net/8021q/vlan_netlink.c:185 [ ] rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] [ ] __rtnl_newlink+0xa58/0xdc0 net/core/rtnetlink.c:3580 [ ] rtnl_newlink+0x49/0x70 net/core/rtnetlink.c:3593 [ ] rtnetlink_rcv_msg+0x21c/0x5c0 net/core/rtnetlink.c:6089 [ ] netlink_rcv_skb+0x87/0x1d0 net/netlink/af_netlink.c:2501 [ ] netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] [ ] netlink_unicast+0x397/0x4c0 net/netlink/af_netlink.c:1345 [ ] netlink_sendmsg+0x396/0x710 net/netlink/af_netlink.c:1921 [ ] sock_sendmsg_nosec net/socket.c:714 [inline] [ ] sock_sendmsg+0x56/0x80 net/socket.c:734 [ ] ____sys_sendmsg+0x36c/0x390 net/socket.c:2488 [ ] ___sys_sendmsg+0x8b/0xd0 net/socket.c:2542 [ ] __sys_sendmsg net/socket.c:2571 [inline] [ ] __do_sys_sendmsg net/socket.c:2580 [inline] [ ] __se_sys_sendmsg net/socket.c:2578 [inline] [ ] __x64_sys_sendmsg+0x78/0xf0 net/socket.c:2578 [ ] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [ ] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [ ] entry_SYSCALL_64_after_hwframe+0x46/0xb0