2021-03-30 15:50:09 +00:00
|
|
|
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
|
|
From: Darren Kenny <darren.kenny@oracle.com>
|
|
|
|
|
Date: Fri, 4 Dec 2020 14:51:30 +0000
|
|
|
|
|
Subject: [PATCH] video/fb/video_fb: Fix possible integer overflow
|
|
|
|
|
|
|
|
|
|
It is minimal possibility that the values being used here will overflow.
|
|
|
|
|
So, change the code to use the safemath function grub_mul() to ensure
|
|
|
|
|
that doesn't happen.
|
|
|
|
|
|
|
|
|
|
Fixes: CID 73761
|
|
|
|
|
|
|
|
|
|
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
|
|
|
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
|
|
|
---
|
|
|
|
|
grub-core/video/fb/video_fb.c | 8 +++++++-
|
|
|
|
|
1 file changed, 7 insertions(+), 1 deletion(-)
|
|
|
|
|
|
|
|
|
|
diff --git a/grub-core/video/fb/video_fb.c b/grub-core/video/fb/video_fb.c
|
2022-03-29 18:03:52 +00:00
|
|
|
index 1c9a138dc..ae6b89f9a 100644
|
2021-03-30 15:50:09 +00:00
|
|
|
--- a/grub-core/video/fb/video_fb.c
|
|
|
|
|
+++ b/grub-core/video/fb/video_fb.c
|
|
|
|
|
@@ -1537,7 +1537,13 @@ doublebuf_pageflipping_init (struct grub_video_mode_info *mode_info,
|
|
|
|
|
volatile void *page1_ptr)
|
|
|
|
|
{
|
|
|
|
|
grub_err_t err;
|
|
|
|
|
- grub_size_t page_size = mode_info->pitch * mode_info->height;
|
|
|
|
|
+ grub_size_t page_size = 0;
|
|
|
|
|
+
|
|
|
|
|
+ if (grub_mul (mode_info->pitch, mode_info->height, &page_size))
|
|
|
|
|
+ {
|
|
|
|
|
+ /* Shouldn't happen, but if it does we've a bug. */
|
|
|
|
|
+ return GRUB_ERR_BUG;
|
|
|
|
|
+ }
|
|
|
|
|
|
|
|
|
|
framebuffer.offscreen_buffer = grub_malloc (page_size);
|
|
|
|
|
if (! framebuffer.offscreen_buffer)
|
