diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index 7db0398b5..7437db8e2 100644
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -3680,6 +3680,8 @@ static int SDLCALL SDL_SW_RenderGeometryRaw(SDL_Renderer *renderer,
                 s.y = uv0_[1] * texh;
                 s.w = uv1_[0] * texw - s.x;
                 s.h = uv1_[1] * texh - s.y;
+            } else {
+                s.x = s.y = s.w = s.h = 0;
             }
 
             d.x = xy0_[0];
diff --git a/src/stdlib/SDL_string.c b/src/stdlib/SDL_string.c
index dc47d60d6..6b8387145 100644
--- a/src/stdlib/SDL_string.c
+++ b/src/stdlib/SDL_string.c
@@ -1050,7 +1050,7 @@ int SDL_strncmp(const char *str1, const char *str2, size_t maxlen)
 #if defined(HAVE_STRNCMP)
     return strncmp(str1, str2, maxlen);
 #else
-    int result;
+    int result = 0;
 
     while (maxlen) {
         result = (int)(unsigned char)*str1 - (unsigned char)*str2;
@@ -1061,9 +1061,6 @@ int SDL_strncmp(const char *str1, const char *str2, size_t maxlen)
         ++str2;
         --maxlen;
     }
-    if (!maxlen) {
-        result = 0;
-    }
     return result;
 #endif /* HAVE_STRNCMP */
 }
@@ -1098,7 +1095,7 @@ int SDL_strncasecmp(const char *str1, const char *str2, size_t maxlen)
 #elif defined(HAVE__STRNICMP)
     return _strnicmp(str1, str2, maxlen);
 #else
-    int a, b, result;
+    int a, b, result = 0;
 
     while (maxlen) {
         a = SDL_tolower((unsigned char)*str1);
@@ -1111,9 +1108,6 @@ int SDL_strncasecmp(const char *str1, const char *str2, size_t maxlen)
         ++str2;
         --maxlen;
     }
-    if (maxlen == 0) {
-        result = 0;
-    }
     return result;
 #endif /* HAVE_STRNCASECMP */
 }
diff --git a/src/video/SDL_RLEaccel.c b/src/video/SDL_RLEaccel.c
index d9c81f388..1a3ee4a0e 100644
--- a/src/video/SDL_RLEaccel.c
+++ b/src/video/SDL_RLEaccel.c
@@ -175,7 +175,7 @@
         Uint8 *src = from;                                       \
         Uint8 *dst = to;                                         \
         for (i = 0; i < (int)(length); i++) {                    \
-            Uint32 s, d;                                         \
+            Uint32 s = 0, d = 0;                                         \
             unsigned rs, gs, bs, rd, gd, bd;                     \
             switch (bpp) {                                       \
             case 2:                                              \
diff --git a/src/video/SDL_vulkan_utils.c b/src/video/SDL_vulkan_utils.c
index d2f5599ea..2993fc799 100644
--- a/src/video/SDL_vulkan_utils.c
+++ b/src/video/SDL_vulkan_utils.c
@@ -273,7 +273,7 @@ SDL_bool SDL_Vulkan_Display_CreateSurface(void *vkGetInstanceProcAddr_,
         VkDisplayKHR display;
         VkDisplayPlanePropertiesKHR *displayPlaneProperties = NULL;
         VkExtent2D extent;
-        VkDisplayPlaneCapabilitiesKHR planeCaps;
+        VkDisplayPlaneCapabilitiesKHR planeCaps = { 0 };
 
         /* Get information about the physical displays */
         result = vkGetPhysicalDeviceDisplayPropertiesKHR(physicalDevice, &displayPropertiesCount, NULL);