heifsave: clip out of range values when packing 16-bit to 8-bit

kleisauke · kleisauke · commit de23de171b80 · 2025-05-20T09:53:42.000+02:00
diff --git a/libvips/foreign/heifsave.c b/libvips/foreign/heifsave.c
@@ -399,7 +399,7 @@ vips_foreign_save_heif_pack(VipsForeignSaveHeif *heif,
 		for (i = 0; i < ne; i++) {
 			guint16 v = *((gushort *) p) >> shift;
 
-			q[i] = v;
+			q[i] = VIPS_MIN(v, UCHAR_MAX);
 
 			p += 2;
 		}

Original file line number	Diff line number	Diff line change
`@@ -399,7 +399,7 @@ vips_foreign_save_heif_pack(VipsForeignSaveHeif *heif,`
`399`	`399`	`for (i = 0; i < ne; i++) {`
`400`	`400`	`guint16 v = ((gushort ) p) >> shift;`
`401`	`401`
`402`		`- q[i] = v;`
	`402`	`+ q[i] = VIPS_MIN(v, UCHAR_MAX);`
`403`	`403`
`404`	`404`	`p += 2;`
`405`	`405`	`}`