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