[PATCH] GNU canonicalize_file_name can return a NULL pointer

["Timothy Redaelli" <timothy.redaelli@gmail.com>]

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Hi,
In Src/hist.c on line 1668 there is a NULL pointer dereference because GNU  
canonicalize_file_name returns NULL on some errors.

In attachment you will find a small patch that fixes that bug.

If you want to reproduce it you can do (under GNU/Linux) a simple: zsh -c  
'a=(a /b) ; echo ${a:A}'

Thanks

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From cd107ed1c3cc638f0d699516b544128d1b1c7f1d Mon Sep 17 00:00:00 2001
From: Timothy Redaelli <timothy.redaelli@gmail.com>
Date: Tue, 7 Feb 2012 19:36:42 +0100
Subject: [PATCH] GNU canonicalize_file_name can return a NULL pointer.

---
 Src/hist.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/Src/hist.c b/Src/hist.c
index aeb6edd..4d522dd 100644
--- a/Src/hist.c
+++ b/Src/hist.c
@@ -1664,6 +1664,11 @@ chrealpath(char **junkptr)
 	    errno == ENAMETOOLONG || errno == ENOMEM)
 	    return 0;
 
+#ifdef HAVE_CANONICALIZE_FILE_NAME
+	if (!real)
+	    return 0;
+#endif
+
 	if (nonreal == *junkptr) {
 	    *real = '\0';
 	    break;
-- 
1.7.9