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From 610c5986058312cfc0375fc04f88fcc116bdd043 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Mon, 28 Jun 2021 14:16:58 +1000
Subject: video/readers/jpeg: Do not reallocate a given huff table
Fix a memory leak where an invalid file could cause us to reallocate
memory for a huffman table we had already allocated memory for.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
grub-core/video/readers/jpeg.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/grub-core/video/readers/jpeg.c b/grub-core/video/readers/jpeg.c
index 10225abd5..caa211f06 100644
--- a/grub-core/video/readers/jpeg.c
+++ b/grub-core/video/readers/jpeg.c
@@ -245,6 +245,9 @@ grub_jpeg_decode_huff_table (struct grub_jpeg_data *data)
n += count[i];
id += ac * 2;
+ if (data->huff_value[id] != NULL)
+ return grub_error (GRUB_ERR_BAD_FILE_TYPE,
+ "jpeg: attempt to reallocate huffman table");
data->huff_value[id] = grub_malloc (n);
if (grub_errno)
return grub_errno;
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