瀏覽代碼

[pixbuf] Avoid potential division by zero

Avoid potential division by zero when performing the check against
multiplication overflow.  (Note that if the width is zero then there
can be no overflow anyway, so it is then safe to bypass the check.)

Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 7 年之前
父節點
當前提交
966a960a83
共有 1 個文件被更改,包括 3 次插入1 次删除
  1. 3
    1
      src/core/pixbuf.c

+ 3
- 1
src/core/pixbuf.c 查看文件

@@ -68,8 +68,10 @@ struct pixel_buffer * alloc_pixbuf ( unsigned int width, unsigned int height ) {
68 68
 	pixbuf->len = ( width * height * sizeof ( uint32_t ) );
69 69
 
70 70
 	/* Check for multiplication overflow */
71
-	if ( ( ( pixbuf->len / sizeof ( uint32_t ) ) / width ) != height )
71
+	if ( ( width != 0 ) &&
72
+	     ( ( pixbuf->len / sizeof ( uint32_t ) ) / width ) != height ) {
72 73
 		goto err_overflow;
74
+	}
73 75
 
74 76
 	/* Allocate pixel data buffer */
75 77
 	pixbuf->data = umalloc ( pixbuf->len );

Loading…
取消
儲存