netdev - [PATCH AUTOSEL 5.15 13/14] tipc: re-order conditions in tipc_crypto_key

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Message-Id: <20250126150430.958708-13-sashal@kernel.org>
Date: Sun, 26 Jan 2025 10:04:29 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Simon Horman <horms@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	Sasha Levin <sashal@...nel.org>,
	jmaloy@...hat.com,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org,
	tipc-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 5.15 13/14] tipc: re-order conditions in tipc_crypto_key_rcv()

From: Dan Carpenter <dan.carpenter@...aro.org>

[ Upstream commit 5fe71fda89745fc3cd95f70d06e9162b595c3702 ]

On a 32bit system the "keylen + sizeof(struct tipc_aead_key)" math could
have an integer wrapping issue.  It doesn't matter because the "keylen"
is checked on the next line, but just to make life easier for static
analysis tools, let's re-order these conditions and avoid the integer
overflow.

Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/tipc/crypto.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/tipc/crypto.c b/net/tipc/crypto.c
index 86d1e782b8fca..b09c4a17b283e 100644
--- a/net/tipc/crypto.c
+++ b/net/tipc/crypto.c
@@ -2304,8 +2304,8 @@ static bool tipc_crypto_key_rcv(struct tipc_crypto *rx, struct tipc_msg *hdr)
 	keylen = ntohl(*((__be32 *)(data + TIPC_AEAD_ALG_NAME)));
 
 	/* Verify the supplied size values */
-	if (unlikely(size != keylen + sizeof(struct tipc_aead_key) ||
-		     keylen > TIPC_AEAD_KEY_SIZE_MAX)) {
+	if (unlikely(keylen > TIPC_AEAD_KEY_SIZE_MAX ||
+		     size != keylen + sizeof(struct tipc_aead_key))) {
 		pr_debug("%s: invalid MSG_CRYPTO key size\n", rx->name);
 		goto exit;
 	}
-- 
2.39.5