[PATCH] net/mlx5e: ethtool: Fix formatting of ptp_rq0_csum_complete_tail_slow

[Kees Cook]

The new GCC 15 warning -Wunterminated-string-initialization reports:

In file included from drivers/net/ethernet/mellanox/mlx5/core/en.h:55,
                 from drivers/net/ethernet/mellanox/mlx5/core/en_stats.c:34:
drivers/net/ethernet/mellanox/mlx5/core/en_stats.h:57:46: warning: initializer-string for array of 'char' truncates NUL terminator but destination lacks 'nonstring' attribute (33 chars into 32 available) [-Wunterminated-string-initialization]
   57 | #define MLX5E_DECLARE_PTP_RQ_STAT(type, fld) "ptp_rq%d_"#fld, offsetof(type, fld)
      |                                              ^~~~~~~~~~~
drivers/net/ethernet/mellanox/mlx5/core/en_stats.c:2279:11: note: in expansion of macro 'MLX5E_DECLARE_PTP_RQ_STAT'
 2279 |         { MLX5E_DECLARE_PTP_RQ_STAT(struct mlx5e_rq_stats, csum_complete_tail_slow) },
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~

This stat string is being used in ethtool_sprintf(), so it must be a
valid NUL-terminated string. Currently the string lacks the final NUL
byte (as GCC warns), but by absolute luck, the next byte in memory is a
space (decimal 32) followed by a NUL. "format" is immediately followed
by little-endian size_t:

struct counter_desc {
        char                       format[32];           /*     0    32 */
        size_t                     offset;               /*    32     8 */
};

The "offset" member is populated by the stats member offset:

 #define MLX5E_DECLARE_PTP_RQ_STAT(type, fld) "ptp_rq%d_"#fld, offsetof(type, fld)

which for this struct mlx5e_rq_stats member, csum_complete_tail_slow, is
32, or space, and then the rest of the "offset" bytes are NULs.

struct mlx5e_rq_stats {
	...
        u64                        csum_complete_tail_slow; /* 32     8 */

The use of vsnprintf(), within ethtool_sprintf(), reads past the end of
"format" and sees the format string as "ptp_rq%d_csum_complete_tail_slow ",
with %d getting resolved by MLX5E_PTP_CHANNEL_IX (value 0):

                       ethtool_sprintf(data, ptp_rq_stats_desc[i].format,
                                       MLX5E_PTP_CHANNEL_IX);

With an output result of "ptp_rq0_csum_complete_tail_slow", which gets
precisely truncated to 31 characters with a trailing NUL.

So, instead of accidentally getting this correct due to the NUL bytes
at the end of the size_t that happens to follow the format string, just
make the string initializer 1 byte shorter by replacing "%d" with "0",
since MLX5E_PTP_CHANNEL_IX is already hard-coded. This results in no
initializer truncation and no need to call sprintf().

Signed-off-by: Kees Cook <kees@xxxxxxxxxx>
---
Cc: Saeed Mahameed <saeedm@xxxxxxxxxx>
Cc: Tariq Toukan <tariqt@xxxxxxxxxx>
Cc: Leon Romanovsky <leon@xxxxxxxxxx>
Cc: Andrew Lunn <andrew+netdev@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: Richard Cochran <richardcochran@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-rdma@xxxxxxxxxxxxxxx
---
 drivers/net/ethernet/mellanox/mlx5/core/en_stats.c | 3 +--
 drivers/net/ethernet/mellanox/mlx5/core/en_stats.h | 2 +-
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
index 1c121b435016..19664fa7f217 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
@@ -2424,8 +2424,7 @@ static MLX5E_DECLARE_STATS_GRP_OP_FILL_STRS(ptp)
 	}
 	if (priv->rx_ptp_opened) {
 		for (i = 0; i < NUM_PTP_RQ_STATS; i++)
-			ethtool_sprintf(data, ptp_rq_stats_desc[i].format,
-					MLX5E_PTP_CHANNEL_IX);
+			ethtool_puts(data, ptp_rq_stats_desc[i].format);
 	}
 }
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
index 8de6fcbd3a03..def5dea1463d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.h
@@ -54,7 +54,7 @@
 #define MLX5E_DECLARE_PTP_TX_STAT(type, fld) "ptp_tx%d_"#fld, offsetof(type, fld)
 #define MLX5E_DECLARE_PTP_CH_STAT(type, fld) "ptp_ch_"#fld, offsetof(type, fld)
 #define MLX5E_DECLARE_PTP_CQ_STAT(type, fld) "ptp_cq%d_"#fld, offsetof(type, fld)
-#define MLX5E_DECLARE_PTP_RQ_STAT(type, fld) "ptp_rq%d_"#fld, offsetof(type, fld)
+#define MLX5E_DECLARE_PTP_RQ_STAT(type, fld) "ptp_rq0_"#fld, offsetof(type, fld)
 
 #define MLX5E_DECLARE_QOS_TX_STAT(type, fld) "qos_tx%d_"#fld, offsetof(type, fld)
 
-- 
2.34.1