Description
In the Linux kernel, the following vulnerability has been resolved:
wireguard: socket: free skb in send6 when ipv6 is disabled
I got a memory leak report:
unreferenced object 0xffff8881191fc040 (size 232):
comm "kworker/u17:0", pid 23193, jiffies 4295238848 (age 3464.870s)
hex dump (first 32 bytes):
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 00 00 00 00 00 00 ................
backtrace:
[] slab_post_alloc_hook+0x84/0x3b0
[] kmem_cache_alloc_node+0x167/0x340
[] __alloc_skb+0x1db/0x200
[] wg_socket_send_buffer_to_peer+0x3d/0xc0
[] wg_packet_send_handshake_initiation+0xfa/0x110
[] wg_packet_handshake_send_worker+0x21/0x30
[] process_one_work+0x2e8/0x770
[] worker_thread+0x4a/0x4b0
[] kthread+0x120/0x160
[] ret_from_fork+0x1f/0x30
In function wg_socket_send_buffer_as_reply_to_skb() or wg_socket_send_
buffer_to_peer(), the semantics of send6() is required to free skb. But
when CONFIG_IPV6 is disable, kfree_skb() is missing. This patch adds it
to fix this bug.