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net/mlx5: fw_tracer, Handle escaped percent properly

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The firmware tracer's format string validation and parameter counting
did not properly handle escaped percent signs (%%). This caused
fw_tracer to count more parameters when trace format strings contained
literal percent characters.

To fix it, allow %% to pass string validation and skip %% sequences when
counting parameters since they represent literal percent signs rather
than format specifiers.

Fixes: 70dd6fdb89 ("net/mlx5: FW tracer, parse traces and kernel tracing support")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reported-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Closes: https://lore.kernel.org/netdev/hanz6rzrb2bqbplryjrakvkbmv4y5jlmtthnvi3thg5slqvelp@t3s3erottr6s/
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1765284977-1363052-5-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Shay Drory 2025-12-09 14:56:12 +02:00 committed by Paolo Abeni
parent b35966042d
commit c0289f67f7
1 changed files with 14 additions and 6 deletions
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20
drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
View File

@ -368,11 +368,11 @@ static bool mlx5_is_valid_spec(const char *str)
while (isdigit(*str) || *str == '#' || *str == '.' || *str == 'l')
str++;
/* Check if it's a valid integer/hex specifier:
/* Check if it's a valid integer/hex specifier or %%:
* Valid formats: %x, %d, %i, %u, etc.
*/
if (*str != 'x' && *str != 'X' && *str != 'd' && *str != 'i' &&
*str != 'u' && *str != 'c')
*str != 'u' && *str != 'c' && *str != '%')
return false;
return true;
@ -390,7 +390,11 @@ static bool mlx5_tracer_validate_params(const char *str)
if (!mlx5_is_valid_spec(substr + 1))
return false;
substr = strstr(substr + 1, PARAM_CHAR);
if (*(substr + 1) == '%')
substr = strstr(substr + 2, PARAM_CHAR);
else
substr = strstr(substr + 1, PARAM_CHAR);
}
return true;
@ -469,11 +473,15 @@ static int mlx5_tracer_get_num_of_params(char *str)
substr = strstr(pstr, VAL_PARM);
}
/* count all the % characters */
/* count all the % characters, but skip %% (escaped percent) */
substr = strstr(str, PARAM_CHAR);
while (substr) {
num_of_params += 1;
str = substr + 1;
if (*(substr + 1) != '%') {
num_of_params += 1;
str = substr + 1;
} else {
str = substr + 2;
}
substr = strstr(str, PARAM_CHAR);
}