net/handshake: Fix memory leak in tls_handshake_accept()

In tls_handshake_accept(), a netlink message is allocated using
genlmsg_new(). In the error handling path, genlmsg_cancel() is called
to cancel the message construction, but the message itself is not freed.
This leads to a memory leak.

Fix this by calling nlmsg_free() in the error path after genlmsg_cancel()
to release the allocated memory.

Fixes: 2fd5532044a89 ("net/handshake: Add a kernel API for requesting a TLSv1.3 handshake")
Signed-off-by: Zilin Guan <[e-mail]>
Reviewed-by: Chuck Lever <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/handshake/tlshd.c

···
 
 out_cancel:
 	genlmsg_cancel(msg, hdr);
+	nlmsg_free(msg);
 out:
 	return ret;
 }