Check SDL_LockSurface() return value

src/render/software/SDL_render_sw.c

@@ -135,7 +135,9 @@ static int SW_UpdateTexture(SDL_Renderer *renderer, SDL_Texture *texture,
     size_t length;
 
     if (SDL_MUSTLOCK(surface)) {
-        SDL_LockSurface(surface);
+        if (SDL_LockSurface(surface) < 0) {
+            return -1;
+        }
     }
     src = (Uint8 *)pixels;
     dst = (Uint8 *)surface->pixels +
@@ -341,7 +343,9 @@ static int SW_RenderCopyEx(SDL_Renderer *renderer, SDL_Surface *surface, SDL_Tex
      * necessary because this code is going to access the pixel buffer directly.
      */
     if (SDL_MUSTLOCK(src)) {
-        SDL_LockSurface(src);
+        if (SDL_LockSurface(src) < 0) {
+            return -1;
+        }
     }
 
     /* Clone the source surface but use its pixel buffer directly.

src/render/software/SDL_rotate.c

@@ -561,7 +561,10 @@ SDL_Surface *SDLgfx_rotateSurface(SDL_Surface *src, double angle, int smooth, in
 
     /* Lock source surface */
     if (SDL_MUSTLOCK(src)) {
-        SDL_LockSurface(src);
+        if (SDL_LockSurface(src) < 0) {
+            SDL_DestroySurface(rz_dst);
+            return NULL;
+        }
     }
 
     /* check if the rotation is a multiple of 90 degrees so we can take a fast path and also somewhat reduce

src/video/SDL_surface.c

@@ -2045,7 +2045,9 @@ int SDL_ReadSurfacePixel(SDL_Surface *surface, int x, int y, Uint8 *r, Uint8 *g,
     bytes_per_pixel = SDL_BYTESPERPIXEL(surface->format);
 
     if (SDL_MUSTLOCK(surface)) {
-        SDL_LockSurface(surface);
+        if (SDL_LockSurface(surface) < 0) {
+            return -1;
+        }
     }
 
     p = (Uint8 *)surface->pixels + y * surface->pitch + x * bytes_per_pixel;