[net-next 03/10] devlink: Add helper function for safely copy string param

[Saeed Mahameed]

From: Moshe Shemesh <mo...@mellanox.com>

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 <mo...@mellanox.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Saeed Mahameed <sae...@mellanox.com>
---
 include/net/devlink.h | 12 ++++++++++--
 net/core/devlink.c    | 19 ++++++++++++++++++-
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index b0e17c025fdc..99efc156a309 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -298,7 +298,7 @@ struct devlink_resource {
 
 #define DEVLINK_RESOURCE_ID_PARENT_TOP 0
 
-#define DEVLINK_PARAM_MAX_STRING_VALUE 32
+#define __DEVLINK_PARAM_MAX_STRING_VALUE 32
 enum devlink_param_type {
        DEVLINK_PARAM_TYPE_U8,
        DEVLINK_PARAM_TYPE_U16,
@@ -311,7 +311,7 @@ union devlink_param_value {
        u8 vu8;
        u16 vu16;
        u32 vu32;
-       char vstr[DEVLINK_PARAM_MAX_STRING_VALUE];
+       char vstr[__DEVLINK_PARAM_MAX_STRING_VALUE];
        bool vbool;
 };
 
@@ -553,6 +553,8 @@ int devlink_param_driverinit_value_get(struct devlink 
*devlink, u32 param_id,
 int devlink_param_driverinit_value_set(struct devlink *devlink, u32 param_id,
                                       union devlink_param_value init_val);
 void devlink_param_value_changed(struct devlink *devlink, u32 param_id);
+void devlink_param_value_str_fill(union devlink_param_value *dst_val,
+                                 const char *src);
 struct devlink_region *devlink_region_create(struct devlink *devlink,
                                             const char *region_name,
                                             u32 region_max_snapshots,
@@ -789,6 +791,12 @@ devlink_param_value_changed(struct devlink *devlink, u32 
param_id)
 {
 }
 
+static inline void
+devlink_param_value_str_fill(union devlink_param_value *dst_val,
+                            const char *src)
+{
+}
+
 static inline struct devlink_region *
 devlink_region_create(struct devlink *devlink,
                      const char *region_name,
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 99ad53e8297f..367564099357 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -3012,7 +3012,7 @@ devlink_param_value_get_from_info(const struct 
devlink_param *param,
                break;
        case DEVLINK_PARAM_TYPE_STRING:
                if (nla_len(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]) >
-                   DEVLINK_PARAM_MAX_STRING_VALUE)
+                   __DEVLINK_PARAM_MAX_STRING_VALUE)
                        return -EINVAL;
                strcpy(value->vstr,
                       nla_data(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]));
@@ -4614,6 +4614,23 @@ 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
  *
-- 
2.17.0