tls: stop recv() if initial process_rx_list gave us non-DATA

jira VULN-131360
cve CVE-2024-58239
commit-author Sabrina Dubroca <sd@queasysnail.net>
commit fdfbaec

If we have a non-DATA record on the rx_list and another record of the
same type still on the queue, we will end up merging them:
 - process_rx_list copies the non-DATA record
 - we start the loop and process the first available record since it's
   of the same type
 - we break out of the loop since the record was not DATA

Just check the record type and jump to the end in case process_rx_list
did some work.

Fixes: 692d7b5 ("tls: Fix recvmsg() to be able to peek across multiple records")
	Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Link: https://lore.kernel.org/r/bd31449e43bd4b6ff546f5c51cf958c31c511deb.1708007371.git.sd@queasysnail.net
	Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit fdfbaec)
	Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>

Author: bmastbergen

net/tls/tls_sw.c

@@ -1944,7 +1944,7 @@ int tls_sw_recvmsg(struct sock *sk,
 		goto end;
 
 	copied = err;
-	if (len <= copied)
+	if (len <= copied || (copied && control != TLS_RECORD_TYPE_DATA))
 		goto end;
 
 	target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);