From: Saeed Mahameed <saeed@kernel.org>
To: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Eric Dumazet <edumazet@google.com>
Cc: Saeed Mahameed <saeedm@nvidia.com>,
netdev@vger.kernel.org, Tariq Toukan <tariqt@nvidia.com>,
Leon Romanovsky <leonro@nvidia.com>,
Rahul Rameshbabu <rrameshbabu@nvidia.com>,
Dragos Tatulea <dtatulea@nvidia.com>
Subject: [net-next 12/15] net/mlx5e: Check return value of snprintf writing to fw_version buffer
Date: Thu, 19 Oct 2023 20:04:19 -0700 [thread overview]
Message-ID: <20231020030422.67049-13-saeed@kernel.org> (raw)
In-Reply-To: <20231020030422.67049-1-saeed@kernel.org>
From: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Treat the operation as an error case when the return value is equivalent to
the size of the name buffer. Failed to write null terminator to the name
buffer, making the string malformed and should not be used. Provide a
string with only the firmware version when forming the string with the
board id fails.
Without check, will trigger -Wformat-truncation with W=1.
drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c: In function 'mlx5e_ethtool_get_drvinfo':
drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c:49:31: warning: '%.16s' directive output may be truncated writing up to 16 bytes into a region of size between 13 and 22 [-Wformat-truncation=]
49 | "%d.%d.%04d (%.16s)",
| ^~~~~
drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c:48:9: note: 'snprintf' output between 12 and 37 bytes into a destination of size 32
48 | snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
49 | "%d.%d.%04d (%.16s)",
| ~~~~~~~~~~~~~~~~~~~~~
50 | fw_rev_maj(mdev), fw_rev_min(mdev), fw_rev_sub(mdev),
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
51 | mdev->board_id);
| ~~~~~~~~~~~~~~~
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d4ab2e97dcfbcd748ae71761a9d8e5e41cc732c
Signed-off-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
---
.../net/ethernet/mellanox/mlx5/core/en_ethtool.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 215261a69255..792a0ea544cd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -43,12 +43,17 @@ void mlx5e_ethtool_get_drvinfo(struct mlx5e_priv *priv,
struct ethtool_drvinfo *drvinfo)
{
struct mlx5_core_dev *mdev = priv->mdev;
+ int count;
strscpy(drvinfo->driver, KBUILD_MODNAME, sizeof(drvinfo->driver));
- 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);
+ 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))
+ snprintf(drvinfo->fw_version, sizeof(drvinfo->fw_version),
+ "%d.%d.%04d", fw_rev_maj(mdev),
+ fw_rev_min(mdev), fw_rev_sub(mdev));
+
strscpy(drvinfo->bus_info, dev_name(mdev->device),
sizeof(drvinfo->bus_info));
}
--
2.41.0
next prev parent reply other threads:[~2023-10-20 3:04 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-20 3:04 [pull request][net-next 00/15] mlx5 updates 2023-10-19 Saeed Mahameed
2023-10-20 3:04 ` [net-next 01/15] xfrm: generalize xdo_dev_state_update_curlft to allow statistics update Saeed Mahameed
2023-10-20 8:07 ` Steffen Klassert
2023-10-20 3:04 ` [net-next 02/15] xfrm: get global statistics from the offloaded device Saeed Mahameed
2023-10-20 8:08 ` Steffen Klassert
2023-10-20 3:04 ` [net-next 03/15] net/mlx5e: Honor user choice of IPsec replay window size Saeed Mahameed
2023-10-21 1:48 ` Jakub Kicinski
2023-10-21 6:39 ` Saeed Mahameed
2023-10-20 3:04 ` [net-next 04/15] net/mlx5e: Ensure that IPsec sequence packet number starts from 1 Saeed Mahameed
2023-10-20 3:04 ` [net-next 05/15] net/mlx5e: Unify esw and normal IPsec status table creation/destruction Saeed Mahameed
2023-10-20 3:04 ` [net-next 06/15] net/mlx5e: Remove exposure of IPsec RX flow steering struct Saeed Mahameed
2023-10-20 3:04 ` [net-next 07/15] net/mlx5e: Add IPsec and ASO syndromes check in HW Saeed Mahameed
2023-10-20 3:04 ` [net-next 08/15] net/mlx5e: Connect mlx5 IPsec statistics with XFRM core Saeed Mahameed
2023-10-20 3:04 ` [net-next 09/15] net/mlx5e: Delete obsolete IPsec code Saeed Mahameed
2023-10-20 3:04 ` [net-next 10/15] net/mlx5: Increase size of irq name buffer Saeed Mahameed
2023-10-20 3:04 ` [net-next 11/15] net/mlx5e: Reduce the size of icosq_str Saeed Mahameed
2023-10-20 3:04 ` Saeed Mahameed [this message]
2023-10-20 3:04 ` [net-next 13/15] net/mlx5e: Check return value of snprintf writing to fw_version buffer for representors Saeed Mahameed
2023-10-20 3:04 ` [net-next 14/15] net/mlx5: print change on SW reset semaphore returns busy Saeed Mahameed
2023-10-20 3:04 ` [net-next 15/15] net/mlx5: Allow sync reset flow when BF MGT interface device is present Saeed Mahameed
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