5.4-stable review patch. If anyone has any objections, please let me know.
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From: Rahul Rameshbabu rrameshbabu@nvidia.com
[ 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 --- drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c index ed37cc7c9ae00..a40fecfdb10ca 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));