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Subject[PATCH net 1/3] devlink: Fix param set handling for string type
Date
In case devlink param type is string, it needs to copy the string value
it got from the input to devlink_param_value.

Fixes: e3b7ca18ad7b ("devlink: Add param set command")
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
---
include/net/devlink.h | 2 +-
net/core/devlink.c | 11 ++++++++---
2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index b9b89d6..b0e17c0 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -311,7 +311,7 @@ enum devlink_param_type {
u8 vu8;
u16 vu16;
u32 vu32;
- const char *vstr;
+ char vstr[DEVLINK_PARAM_MAX_STRING_VALUE];
bool vbool;
};

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 8c0ed22..d808af7 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -2995,6 +2995,8 @@ static int devlink_nl_cmd_param_get_dumpit(struct sk_buff *msg,
struct genl_info *info,
union devlink_param_value *value)
{
+ int len;
+
if (param->type != DEVLINK_PARAM_TYPE_BOOL &&
!info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA])
return -EINVAL;
@@ -3010,10 +3012,13 @@ static int devlink_nl_cmd_param_get_dumpit(struct sk_buff *msg,
value->vu32 = nla_get_u32(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]);
break;
case DEVLINK_PARAM_TYPE_STRING:
- if (nla_len(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]) >
- DEVLINK_PARAM_MAX_STRING_VALUE)
+ 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)
return -EINVAL;
- value->vstr = nla_data(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]);
+ strcpy(value->vstr,
+ nla_data(info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA]));
break;
case DEVLINK_PARAM_TYPE_BOOL:
value->vbool = info->attrs[DEVLINK_ATTR_PARAM_VALUE_DATA] ?
--
1.8.3.1
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