From 768ef2199e0265cf455b154f1a80a612f02274c8 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.

Reference:https://git.savannah.gnu.org/cgit/grub.git/commit/?id=768ef2199e0265cf455b154f1a80a612f02274c8
Conflict:NA

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 806c56c..2284a6c 100644
--- a/grub-core/video/readers/jpeg.c
+++ b/grub-core/video/readers/jpeg.c
@@ -251,6 +251,9 @@ 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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