44 lines
1.7 KiB
Diff
44 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Axtens <dja@axtens.net>
|
|
Date: Tue, 6 Jul 2021 19:19:11 +1000
|
|
Subject: [PATCH] video/readers/png: Sanity check some huffman codes
|
|
|
|
ASAN picked up two OOB global reads: we weren't checking if some code
|
|
values fit within the cplens or cpdext arrays. Check and throw an error
|
|
if not.
|
|
|
|
Signed-off-by: Daniel Axtens <dja@axtens.net>
|
|
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
|
|
(cherry picked from commit c3a8ab0cbd24153ec7b1f84a96ddfdd72ef8d117)
|
|
(cherry picked from commit 5d09addf58086aa11d5f9a91af5632ff87c2d2ee)
|
|
(cherry picked from commit ff12584f9376a472f37d4ec14213fd29bf3b233a)
|
|
(cherry picked from commit ac8b5464a076d2e38ecf7f761be9cd1f5bbeb784)
|
|
---
|
|
grub-core/video/readers/png.c | 6 ++++++
|
|
1 file changed, 6 insertions(+)
|
|
|
|
diff --git a/grub-core/video/readers/png.c b/grub-core/video/readers/png.c
|
|
index d7ed5aa6cf..7f2ba7849b 100644
|
|
--- a/grub-core/video/readers/png.c
|
|
+++ b/grub-core/video/readers/png.c
|
|
@@ -753,6 +753,9 @@ grub_png_read_dynamic_block (struct grub_png_data *data)
|
|
int len, dist, pos;
|
|
|
|
n -= 257;
|
|
+ if (((unsigned int) n) >= ARRAY_SIZE (cplens))
|
|
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
+ "png: invalid huff code");
|
|
len = cplens[n];
|
|
if (cplext[n])
|
|
len += grub_png_get_bits (data, cplext[n]);
|
|
@@ -760,6 +763,9 @@ grub_png_read_dynamic_block (struct grub_png_data *data)
|
|
return grub_errno;
|
|
|
|
n = grub_png_get_huff_code (data, &data->dist_table);
|
|
+ if (((unsigned int) n) >= ARRAY_SIZE (cpdist))
|
|
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE,
|
|
+ "png: invalid huff code");
|
|
dist = cpdist[n];
|
|
if (cpdext[n])
|
|
dist += grub_png_get_bits (data, cpdext[n]);
|