ethdev: validate input in register info

[ upstream commit 94af45f ]

This patch adds validity check of input pointer in regs dump API.

Fixes: 7a3f27c ("ethdev: add access to specific device info")
Fixes: 936eda2 ("net/hns3: support dump register")

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

drivers/net/hns3/hns3_regs.c

@@ -322,11 +322,6 @@ hns3_get_regs(struct rte_eth_dev *eth_dev, struct rte_dev_reg_info *regs)
 	uint32_t *data;
 	int ret;
 
-	if (regs == NULL) {
-		hns3_err(hw, "the input parameter regs is NULL!");
-		return -EINVAL;
-	}
-
 	ret = hns3_get_regs_length(hw, &length);
 	if (ret)
 		return ret;

lib/librte_ethdev/rte_ethdev.c

@@ -5258,6 +5258,8 @@ rte_eth_dev_get_reg_info(uint16_t port_id, struct rte_dev_reg_info *info)
 	struct rte_eth_dev *dev;
 
 	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+	if (info == NULL)
+		return -EINVAL;
 
 	dev = &rte_eth_devices[port_id];
 	RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->get_reg, -ENOTSUP);

lib/librte_ethdev/rte_ethdev.h

@@ -4395,6 +4395,7 @@ int rte_eth_dev_get_eeprom(uint16_t port_id, struct rte_dev_eeprom_info *info);
  * @return
  *   - (0) if successful.
  *   - (-ENOTSUP) if hardware doesn't support.
+ *   - (-EINVAL) if bad parameter.
  *   - (-ENODEV) if *port_id* invalid.
  *   - (-EIO) if device is removed.
  *   - others depends on the specific operations implementation.