net/mlx5e: Correct snprintf truncation handling for fw_version buffer used by represe...

[ Upstream commit b13559b76157de9d74f04d3ca0e49d69de3b5675 ]

snprintf returns the length of the formatted string, excluding the trailing
null, without accounting for truncation. This means that is the return
value is greater than or equal to the size parameter, the fw_version string
was truncated.

Link: https://docs.kernel.org/core-api/kernel-api.html#c.snprintf
Fixes: 1b2bd0c0264f ("net/mlx5e: Check return value of snprintf writing to fw_version buffer for representors")
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
index 2653cb96c31052000026821b72ab0e780949c581..5aeca9534f15a4c37e85c239823225e1710e9552 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
@@ -76,7 +76,7 @@ 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));