netdev - [PATCH net] net/mlx5e: Fix snprintf return check

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Date: Mon, 27 Nov 2023 16:00:53 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Rahul Rameshbabu <rrameshbabu@...dia.com>
Cc: Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Dragos Tatulea <dtatulea@...dia.com>, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net] net/mlx5e: Fix snprintf return check

This code prints a string and then if there wasn't enough space for the
whole string, then it prints a slightly shorter string.  However, the
test for overflow should have been >= instead of == because snprintf()
returns the number of bytes which *would* have been printed if there
were enough space.

Fixes: 41e63c2baa11 ("net/mlx5e: Check return value of snprintf writing to fw_version buffer")
Fixes: 1b2bd0c0264f ("net/mlx5e: Check return value of snprintf writing to fw_version buffer for representors")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c | 2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en_rep.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 792a0ea544cd..c7c1b667b105 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -49,7 +49,7 @@ void mlx5e_ethtool_get_drvinfo(struct mlx5e_priv *priv,
 	count = snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
 			 "%d.%d.%04d (%.16s)", fw_rev_maj(mdev),
 			 fw_rev_min(mdev), fw_rev_sub(mdev), mdev->board_id);
-	if (count == sizeof(drvinfo->fw_version))
+	if (count >= sizeof(drvinfo->fw_version))
 		snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
 			 "%d.%d.%04d", fw_rev_maj(mdev),
 			 fw_rev_min(mdev), fw_rev_sub(mdev));
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index fe0726c7b847..a7c77a63cc29 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -78,7 +78,7 @@ static void mlx5e_rep_get_drvinfo(struct net_device *dev,
 	count = snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
 			 "%d.%d.%04d (%.16s)", fw_rev_maj(mdev),
 			 fw_rev_min(mdev), fw_rev_sub(mdev), mdev->board_id);
-	if (count == sizeof(drvinfo->fw_version))
+	if (count >= sizeof(drvinfo->fw_version))
 		snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
 			 "%d.%d.%04d", fw_rev_maj(mdev),
 			 fw_rev_min(mdev), fw_rev_sub(mdev));
-- 
2.42.0