tls: always refresh the queue when reading sock

JIRA: https://issues.redhat.com/browse/RHEL-106093
CVE: CVE-2025-38471

commit 4ab26bc
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Wed Jul 16 07:38:50 2025 -0700

    tls: always refresh the queue when reading sock

    After recent changes in net-next TCP compacts skbs much more
    aggressively. This unearthed a bug in TLS where we may try
    to operate on an old skb when checking if all skbs in the
    queue have matching decrypt state and geometry.

        BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls]
        (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544)
        Read of size 4 at addr ffff888013085750 by task tls/13529

        CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme
        Call Trace:
         kasan_report+0xca/0x100
         tls_strp_check_rcv+0x898/0x9a0 [tls]
         tls_rx_rec_wait+0x2c9/0x8d0 [tls]
         tls_sw_recvmsg+0x40f/0x1aa0 [tls]
         inet_recvmsg+0x1c3/0x1f0

    Always reload the queue, fast path is to have the record in the queue
    when we wake, anyway (IOW the path going down "if !strp->stm.full_len").

    Fixes: 0d87bbd ("tls: strp: make sure the TCP skbs do not have overlapping data")
    Link: https://patch.msgid.link/20250716143850.1520292-1-kuba@kernel.org
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

Author: CKI Backport Bot

net/tls/tls_strp.c

@@ -511,9 +511,8 @@ static int tls_strp_read_sock(struct tls_strparser *strp)
 	if (inq < strp->stm.full_len)
 		return tls_strp_read_copy(strp, true);
 
+	tls_strp_load_anchor_with_queue(strp, inq);
 	if (!strp->stm.full_len) {
-		tls_strp_load_anchor_with_queue(strp, inq);
-
 		sz = tls_rx_msg_size(strp, strp->anchor);
 		if (sz < 0) {
 			tls_strp_abort_strp(strp, sz);