linux-kernel - [PATCH] strparser: Fix signed/unsigned mismatch bug

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Message-ID: <20251104174205.984895-1-nate.karstens@garmin.com>
Date: Tue, 4 Nov 2025 11:42:03 -0600
From: Nate Karstens <nate.karstens@...min.com>
To: <netdev@...r.kernel.org>
CC: Nate Karstens <nate.karstens@...min.com>,
        Nate Karstens
	<nate.karstens@...il.com>,
        Tom Herbert <tom@...ntonium.net>, <stable@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric
 Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>,
        Simon Horman <horms@...nel.org>,
        John Fastabend
	<john.fastabend@...il.com>,
        "Dr. David Alan Gilbert" <linux@...blig.org>,
        Jiayuan Chen <mrpre@....com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] strparser: Fix signed/unsigned mismatch bug

The `len` member of the sk_buff is an unsigned int. This is cast to
`ssize_t` (a signed type) for the first sk_buff in the comparison,
but not the second sk_buff. This change ensures both len values are
cast to `ssize_t`.

This appears to cause an issue with ktls when multiple TLS PDUs are
included in a single TCP segment.

Signed-off-by: Nate Karstens <nate.karstens@...min.com>
Cc: stable@...r.kernel.org
---
 net/strparser/strparser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/strparser/strparser.c b/net/strparser/strparser.c
index 43b1f558b33d..e659fea2da70 100644
--- a/net/strparser/strparser.c
+++ b/net/strparser/strparser.c
@@ -238,7 +238,7 @@ static int __strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
 				strp_parser_err(strp, -EMSGSIZE, desc);
 				break;
 			} else if (len <= (ssize_t)head->len -
-					  skb->len - stm->strp.offset) {
+					  (ssize_t)skb->len - stm->strp.offset) {
 				/* Length must be into new skb (and also
 				 * greater than zero)
 				 */
-- 
2.34.1