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31 lines
906 B
Diff
31 lines
906 B
Diff
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From f9ff4a203b8c155d51a208cadadb62f224fba715 Mon Sep 17 00:00:00 2001
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From: Oliver Giles <ohw.giles@gmail.com>
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Date: Mon, 1 Feb 2021 10:18:17 +1300
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Subject: [PATCH] Ensure the size of the version field is 4 bytes
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A corrupted version field size can cause TNEFVersion to access outside
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of allocated memory. Check the version is the expected size and raise
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an error if not.
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Resolves: #86
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Reported-by: jasperla
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---
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lib/ytnef.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/lib/ytnef.c b/lib/ytnef.c
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index b148719..ffede44 100644
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--- a/lib/ytnef.c
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+++ b/lib/ytnef.c
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@@ -335,6 +335,10 @@ int TNEFRendData STD_ARGLIST {
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int TNEFVersion STD_ARGLIST {
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WORD major;
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WORD minor;
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+ if (size != 2 * sizeof(WORD)) {
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+ printf("Incorrect size of version field, suspected corruption\n");
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+ return -1;
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+ }
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minor = SwapWord((BYTE*)data, size);
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major = SwapWord((BYTE*)data + 2, size - 2);
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