|
 |
80913e |
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
80913e |
From: Darren Kenny <darren.kenny@oracle.com>
|
|
|
80913e |
Date: Fri, 4 Dec 2020 15:39:00 +0000
|
|
|
80913e |
Subject: [PATCH] video/readers/jpeg: Test for an invalid next marker reference
|
|
|
80913e |
from a jpeg file
|
|
|
80913e |
|
|
|
80913e |
While it may never happen, and potentially could be caught at the end of
|
|
|
80913e |
the function, it is worth checking up front for a bad reference to the
|
|
|
80913e |
next marker just in case of a maliciously crafted file being provided.
|
|
|
80913e |
|
|
|
80913e |
Fixes: CID 73694
|
|
|
80913e |
|
|
|
80913e |
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
|
|
|
80913e |
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
|
80913e |
---
|
|
|
80913e |
grub-core/video/readers/jpeg.c | 6 ++++++
|
|
|
80913e |
1 file changed, 6 insertions(+)
|
|
|
80913e |
|
|
|
80913e |
diff --git a/grub-core/video/readers/jpeg.c b/grub-core/video/readers/jpeg.c
|
|
|
80913e |
index 31359a4c9c8..0b6ce3cee64 100644
|
|
|
80913e |
--- a/grub-core/video/readers/jpeg.c
|
|
|
80913e |
+++ b/grub-core/video/readers/jpeg.c
|
|
|
80913e |
@@ -253,6 +253,12 @@ grub_jpeg_decode_quan_table (struct grub_jpeg_data *data)
|
|
|
80913e |
next_marker = data->file->offset;
|
|
|
80913e |
next_marker += grub_jpeg_get_word (data);
|
|
|
80913e |
|
|
|
80913e |
+ if (next_marker > data->file->size)
|
|
|
80913e |
+ {
|
|
|
80913e |
+ /* Should never be set beyond the size of the file. */
|
|
|
80913e |
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE, "jpeg: invalid next reference");
|
|
|
80913e |
+ }
|
|
|
80913e |
+
|
|
|
80913e |
while (data->file->offset + sizeof (data->quan_table[id]) + 1
|
|
|
80913e |
<= next_marker)
|
|
|
80913e |
{
|