Merge pull request #8398 from PavlNekrasov/fix/null-check-before-dereference-imIn

Author: hugovk

src/libImaging/Geometry.c

@@ -1035,6 +1035,10 @@ ImagingTransformAffine(
     double xx, yy;
     double xo, yo;
 
+    if (!imOut || !imIn || strcmp(imIn->mode, imOut->mode) != 0) {
+        return (Imaging)ImagingError_ModeError();
+    }
+
     if (filterid || imIn->type == IMAGING_TYPE_SPECIAL) {
         return ImagingGenericTransform(
             imOut, imIn, x0, y0, x1, y1, affine_transform, a, filterid, fill
@@ -1046,10 +1050,6 @@ ImagingTransformAffine(
         return ImagingScaleAffine(imOut, imIn, x0, y0, x1, y1, a, fill);
     }
 
-    if (!imOut || !imIn || strcmp(imIn->mode, imOut->mode) != 0) {
-        return (Imaging)ImagingError_ModeError();
-    }
-
     if (x0 < 0) {
         x0 = 0;
     }