43 lines
1.3 KiB
Diff
43 lines
1.3 KiB
Diff
From b54f7505732ad5c6237a133c0a1cf00774f13508 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Tue, 6 Jul 2021 23:25:07 +1000
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Subject: [PATCH 2/6] video/readers/png: Avoid heap OOB R/W inserting huff
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table items
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In fuzzing we observed crashes where a code would attempt to be inserted
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into a huffman table before the start, leading to a set of heap OOB reads
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and writes as table entries with negative indices were shifted around and
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the new code written in.
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Catch the case where we would underflow the array and bail.
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Fixes: CVE-2021-3696
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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grub-core/video/readers/png.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/grub-core/video/readers/png.c b/grub-core/video/readers/png.c
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index 1e35eae..0356f91 100644
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--- a/grub-core/video/readers/png.c
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+++ b/grub-core/video/readers/png.c
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@@ -420,6 +420,13 @@ grub_png_insert_huff_item (struct huff_table *ht, int code, int len)
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for (i = len; i < ht->max_length; i++)
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n += ht->maxval[i];
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+ if (n > ht->num_values)
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+ {
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+ grub_error (GRUB_ERR_BAD_FILE_TYPE,
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+ "png: out of range inserting huffman table item");
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+ return;
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+ }
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+
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for (i = 0; i < n; i++)
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ht->values[ht->num_values - i] = ht->values[ht->num_values - i - 1];
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--
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2.17.1
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