From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Alexey Makhalov <amakhalov@vmware.com>

Date: Wed, 8 Jul 2020 20:41:56 +0000

Subject: [PATCH] gfxmenu: Fix double free in load_image()

self->bitmap should be zeroed after free. Otherwise, there is a chance

to double free (USE_AFTER_FREE) it later in rescale_image().

Fixes: CID 292472

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>

Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

Upstream-commit-id: 5d3e84b15a4

---

 grub-core/gfxmenu/gui_image.c | 5 ++++-

 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/grub-core/gfxmenu/gui_image.c b/grub-core/gfxmenu/gui_image.c

index 29784ed2d..6b2e976f1 100644

--- a/grub-core/gfxmenu/gui_image.c

+++ b/grub-core/gfxmenu/gui_image.c

@@ -195,7 +195,10 @@ load_image (grub_gui_image_t self, const char *path)

     return grub_errno;

   if (self->bitmap && (self->bitmap != self->raw_bitmap))

-    grub_video_bitmap_destroy (self->bitmap);

+    {

+      grub_video_bitmap_destroy (self->bitmap);

+      self->bitmap = 0;

+    }

   if (self->raw_bitmap)

     grub_video_bitmap_destroy (self->raw_bitmap);