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devlink: Add helper function for safely copy string param

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Devlink string param buffer is allocated at the size of
DEVLINK_PARAM_MAX_STRING_VALUE. Add helper function which makes sure
this size is not exceeded.
Renamed DEVLINK_PARAM_MAX_STRING_VALUE to
__DEVLINK_PARAM_MAX_STRING_VALUE to emphasize that it should be used by
devlink only. The driver should use the helper function instead to
verify it doesn't exceed the allowed length.

Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Moshe Shemesh 2018-10-10 16:09:27 +03:00 • committed by David S. Miller
parent 1276534c98
commit bde74ad10e
2 changed files with 28 additions and 3 deletions
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19
net/core/devlink.c
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@ -3015,7 +3015,7 @@ devlink_param_value_get_from_info(const struct devlink_param *param,
len = strnlen(nla_data(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]),
nla_len(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]));
if (len == nla_len(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]) ||
len >= DEVLINK_PARAM_MAX_STRING_VALUE)
len >= __DEVLINK_PARAM_MAX_STRING_VALUE)
return -EINVAL;
strcpy(value->vstr,
nla_data(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]));
@ -4617,6 +4617,23 @@ void devlink_param_value_changed(struct devlink *devlink, u32 param_id)
}
EXPORT_SYMBOL_GPL(devlink_param_value_changed);
/**
* devlink_param_value_str_fill - Safely fill-up the string preventing
* from overflow of the preallocated buffer
*
* @dst_val: destination devlink_param_value
* @src: source buffer
*/
void devlink_param_value_str_fill(union devlink_param_value *dst_val,
const char *src)
{
size_t len;
len = strlcpy(dst_val->vstr, src, __DEVLINK_PARAM_MAX_STRING_VALUE);
WARN_ON(len >= __DEVLINK_PARAM_MAX_STRING_VALUE);
}
EXPORT_SYMBOL_GPL(devlink_param_value_str_fill);
/**
* devlink_region_create - create a new address region
*