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guix/gnu/packages/patches/tcsh-fix-out-of-bounds-read...

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Fix out-of-bounds read in c_substitute():
http://seclists.org/oss-sec/2016/q4/612
Patch copied from upstream source repository:
https://github.com/tcsh-org/tcsh/commit/6a542dc4fb2ba26518a47e9b3a9bcd6a91b94596
From 6a542dc4fb2ba26518a47e9b3a9bcd6a91b94596 Mon Sep 17 00:00:00 2001
From: christos <christos>
Date: Fri, 2 Dec 2016 16:59:28 +0000
Subject: [PATCH] Fix out of bounds read (Brooks Davis) (reproduce by starting
tcsh and hitting tab at the prompt)
---
ed.chared.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/ed.chared.c b/ed.chared.c
index 1277e53..310393e 100644
--- ed.chared.c
+++ ed.chared.c
@@ -750,7 +750,7 @@ c_substitute(void)
/*
* If we found a history character, go expand it.
*/
- if (HIST != '\0' && *p == HIST)
+ if (p >= InputBuf && HIST != '\0' && *p == HIST)
nr_exp = c_excl(p);
else
nr_exp = 0;