Fix null pointer dereference in createDevDaxParams()

Fix null pointer dereference in createDevDaxParams().
It fixes the Coverity issue no. 485528.

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

test/pools/jemalloc_coarse_devdax.cpp

@@ -20,6 +20,9 @@ bool devDaxEnvSet() {
 void *createDevDaxParams() {
     char *path = getenv("UMF_TESTS_DEVDAX_PATH");
     char *size = getenv("UMF_TESTS_DEVDAX_SIZE");
+    if (path == nullptr || path[0] == 0 || size == nullptr || size[0] == 0) {
+        return nullptr;
+    }
 
     umf_devdax_memory_provider_params_handle_t params = NULL;
     umf_result_t res =

test/pools/scalable_coarse_devdax.cpp

@@ -20,6 +20,9 @@ bool devDaxEnvSet() {
 void *createDevDaxParams() {
     char *path = getenv("UMF_TESTS_DEVDAX_PATH");
     char *size = getenv("UMF_TESTS_DEVDAX_SIZE");
+    if (path == nullptr || path[0] == 0 || size == nullptr || size[0] == 0) {
+        return nullptr;
+    }
 
     umf_devdax_memory_provider_params_handle_t params = NULL;
     umf_result_t res =