linux-kernel - [PATCH 4.19 058/148] tcp: fix incorrect parameter validation in the do_tcp

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Message-ID: <20240324235012.1356413-59-sashal@kernel.org>
Date: Sun, 24 Mar 2024 19:48:42 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>,
	Jason Xing <kerneljasonxing@...il.com>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 058/148] tcp: fix incorrect parameter validation in the do_tcp_getsockopt() function

From: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>

[ Upstream commit 716edc9706deb3bb2ff56e2eeb83559cea8f22db ]

The 'len' variable can't be negative when assigned the result of
'min_t' because all 'min_t' parameters are cast to unsigned int,
and then the minimum one is chosen.

To fix the logic, check 'len' as read from 'optlen',
where the types of relevant variables are (signed) int.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
Reviewed-by: Jason Xing <kerneljasonxing@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ipv4/tcp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 712186336997b..3df973d22295c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3369,11 +3369,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 	if (get_user(len, optlen))
 		return -EFAULT;
 
-	len = min_t(unsigned int, len, sizeof(int));
-
 	if (len < 0)
 		return -EINVAL;
 
+	len = min_t(unsigned int, len, sizeof(int));
+
 	switch (optname) {
 	case TCP_MAXSEG:
 		val = tp->mss_cache;
-- 
2.43.0