examples/ioat: fix possible null dereference

When searching for raw devices with the correct type, we check the driver
name using strcmp, without first checking that the call to info get
succeeded and assigned a value to that pointer.

If the call to get the device info fails, we can treat it as if the device
didn't match, and continue the loop, so the easiest fix is just to skip the
strcmp if the driver_name is null. [A non-null value from a previous failed
match is ok as it too causes the same behaviour of another loop iteration].

Coverity issue: 350353
Fixes: 2328542ed84e ("examples/ioat: add rawdev copy mode")
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>

diff --git a/examples/ioat/ioatfwd.c b/examples/ioat/ioatfwd.c
index a0cc5c496e8507c41dd1b9e9af07812e36b8c53b..e9117718fea7897b433ec4d4d72a12f4f0fb6ec3 100644 (file)
--- a/examples/ioat/ioatfwd.c
+++ b/examples/ioat/ioatfwd.c
@@ -751,8 +751,9 @@ assign_rawdevs(void)
                                if (rdev_id == rte_rawdev_count())
                                        goto end;
                                rte_rawdev_info_get(rdev_id++, &rdev_info);
-                       } while (strcmp(rdev_info.driver_name,
-                               IOAT_PMD_RAWDEV_NAME_STR) != 0);
+                       } while (rdev_info.driver_name == NULL ||
+                                       strcmp(rdev_info.driver_name,
+                                               IOAT_PMD_RAWDEV_NAME_STR) != 0);
 
                        cfg.ports[i].ioat_ids[j] = rdev_id - 1;
                        configure_rawdev_queue(cfg.ports[i].ioat_ids[j]);