Zero-initialize InstanceExtensionProperties

y-novikov · charles-lunarg · commit 05fdd8629fe2 · 2025-12-12T10:46:27.000-07:00
vkEnumerateInstanceExtensionProperties can fail to initialize ext_props
in loader_add_instance_extensions(), in which case
wsi_unsupported_instance_extension() will call strcmp()
on uninitialized memory.
diff --git a/loader/loader.c b/loader/loader.c
@@ -973,6 +973,7 @@ VkResult loader_add_instance_extensions(const struct loader_instance *inst,
         res = VK_ERROR_OUT_OF_HOST_MEMORY;
         goto out;
     }
+    memset(ext_props, 0, count * sizeof(VkExtensionProperties));
 
     res = fp_get_props(NULL, &count, ext_props);
     if (res != VK_SUCCESS) {

Original file line number	Diff line number	Diff line change
`@@ -973,6 +973,7 @@ VkResult loader_add_instance_extensions(const struct loader_instance *inst,`
`973`	`973`	`res = VK_ERROR_OUT_OF_HOST_MEMORY;`
`974`	`974`	`goto out;`
`975`	`975`	`}`
	`976`	`+ memset(ext_props, 0, count * sizeof(VkExtensionProperties));`
`976`	`977`
`977`	`978`	`res = fp_get_props(NULL, &count, ext_props);`
`978`	`979`	`if (res != VK_SUCCESS) {`