raw/ntb: fix null pointer dereference

  This patch fixes null pointer dereference issues found by coverity scan.

Coverity issue: 344981, 344991, 345000, 345002, 345006, 345024
Fixes: 277310027965 ("raw/ntb: introduce NTB raw device driver")
Cc: stable@dpdk.org

Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
---
 drivers/raw/ntb/ntb.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)
  

On 08/05, Xiaoyun Li wrote:
>This patch fixes null pointer dereference issues found by coverity scan.
>
>Coverity issue: 344981, 344991, 345000, 345002, 345006, 345024
>Fixes: 277310027965 ("raw/ntb: introduce NTB raw device driver")
>Cc: stable@dpdk.org
>
>Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
>---
> drivers/raw/ntb/ntb.c | 18 +++++++++++-------
> 1 file changed, 11 insertions(+), 7 deletions(-)
>
>diff --git a/drivers/raw/ntb/ntb.c b/drivers/raw/ntb/ntb.c
>index 4ba2f3a38..bfecce1e4 100644
>--- a/drivers/raw/ntb/ntb.c
>+++ b/drivers/raw/ntb/ntb.c
>@@ -447,14 +447,16 @@ static int
> ntb_attr_set(struct rte_rawdev *dev, const char *attr_name,
> 				 uint64_t attr_value)
> {
>-	struct ntb_hw *hw = dev->dev_private;
>-	int index = 0;
>+	struct ntb_hw *hw;
>+	int index;
> 
> 	if (dev == NULL || attr_name == NULL) {
> 		NTB_LOG(ERR, "Invalid arguments for setting attributes");
> 		return -EINVAL;
> 	}
> 
>+	hw = dev->dev_private;
>+
> 	if (!strncmp(attr_name, NTB_SPAD_USER, NTB_SPAD_USER_LEN)) {
> 		if (hw->ntb_ops->spad_write == NULL)
> 			return -ENOTSUP;
>@@ -475,14 +477,16 @@ static int
> ntb_attr_get(struct rte_rawdev *dev, const char *attr_name,
> 				 uint64_t *attr_value)
> {
>-	struct ntb_hw *hw = dev->dev_private;
>-	int index = 0;
>+	struct ntb_hw *hw;
>+	int index;
> 
> 	if (dev == NULL || attr_name == NULL || attr_value == NULL) {
> 		NTB_LOG(ERR, "Invalid arguments for getting attributes");
> 		return -EINVAL;
> 	}
> 
>+	hw = dev->dev_private;
>+
> 	if (!strncmp(attr_name, NTB_TOPO_NAME, NTB_ATTR_NAME_LEN)) {
> 		*attr_value = hw->topo;
> 		NTB_LOG(INFO, "Attribute (%s) Value (%" PRIu64 ")",
>@@ -735,7 +739,7 @@ ntb_create(struct rte_pci_device *pci_dev, int socket_id)
> 
> 	if (pci_dev == NULL) {
> 		NTB_LOG(ERR, "Invalid pci_dev.");
>-		ret = -EINVAL;
>+		return -EINVAL;
> 	}
> 
> 	memset(name, 0, sizeof(name));
>@@ -750,7 +754,7 @@ ntb_create(struct rte_pci_device *pci_dev, int socket_id)
> 					 socket_id);
> 	if (rawdev == NULL) {
> 		NTB_LOG(ERR, "Unable to allocate rawdev.");
>-		ret = -EINVAL;
>+		return -EINVAL;
> 	}
> 
> 	rawdev->dev_ops = &ntb_ops;
>@@ -766,7 +770,7 @@ ntb_create(struct rte_pci_device *pci_dev, int socket_id)
> 	return ret;
> 
> fail:
>-	if (rawdev)
>+	if (rawdev != NULL)
> 		rte_rawdev_pmd_release(rawdev);
> 
> 	return ret;
>-- 
>2.17.1
>

Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>
  

05/08/2019 07:50, Ye Xiaolong:
> On 08/05, Xiaoyun Li wrote:
> >This patch fixes null pointer dereference issues found by coverity scan.
> >
> >Coverity issue: 344981, 344991, 345000, 345002, 345006, 345024
> >Fixes: 277310027965 ("raw/ntb: introduce NTB raw device driver")
> >Cc: stable@dpdk.org
> >
> >Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
> 
> Reviewed-by: Xiaolong Ye <xiaolong.ye@intel.com>

Applied, thanks