[pcre] Fix NULL pointer derefernce in pcre_free_study()

[Petr Pisar]

commit 8c176900e5d7a422fd40c8d2edb1bb70c0e6b0d2
Author: Petr Písař <ppisar at redhat.com>
Date:   Mon Jan 2 12:34:42 2012 +0100

    Fix NULL pointer derefernce in pcre_free_study()

 ...eference-NULL-argument-of-pcre_free_study.patch |   30 ++++++++++++++++++++
 pcre.spec                                          |    4 ++
 2 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/pcre-8.21-Do-not-dereference-NULL-argument-of-pcre_free_study.patch b/pcre-8.21-Do-not-dereference-NULL-argument-of-pcre_free_study.patch
new file mode 100644
index 0000000..6349b4e
--- /dev/null
+++ b/pcre-8.21-Do-not-dereference-NULL-argument-of-pcre_free_study.patch
@@ -0,0 +1,30 @@
+From 7ff6515c706e881fe1388576e79d52243e290958 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar at redhat.com>
+Date: Mon, 2 Jan 2012 12:27:29 +0100
+Subject: [PATCH] Do not dereference NULL argument of pcre_free_study()
+
+Back-ported from:
+r836 | ph10 | 2011-12-28 18:16:11 +0100 (St, 28 pro 2011) | 2 lines
+Merging all the changes from the pcre16 branch into the trunk.
+
+Upstream bug #1186.
+---
+ pcre_study.c |    2 ++
+ 1 files changed, 2 insertions(+), 0 deletions(-)
+
+diff --git a/pcre_study.c b/pcre_study.c
+index cb2f23e..0a3ecbc 100644
+--- a/pcre_study.c
++++ b/pcre_study.c
+@@ -1377,6 +1377,8 @@ Returns:    nothing
+ PCRE_EXP_DEFN void
+ pcre_free_study(pcre_extra *extra)
+ {
++if (extra == NULL)
++  return;
+ #ifdef SUPPORT_JIT
+ if ((extra->flags & PCRE_EXTRA_EXECUTABLE_JIT) != 0 &&
+      extra->executable_jit != NULL)
+-- 
+1.7.7.5
+
diff --git a/pcre.spec b/pcre.spec
index 0655b97..9f52cc3 100644
--- a/pcre.spec
+++ b/pcre.spec
@@ -15,6 +15,8 @@ Patch0: pcre-8.21-multilib.patch
 Patch1: pcre-8.20-refused_spelling_terminated.patch
 # Bug #769597, fixed by upstream after 8.21.
 Patch2: pcre-8.21-Do-not-make-unmatched-subpattern-wildcard.patch
+# Upstream bug #1186, fixed by upstream after 8.21.
+Patch3: pcre-8.21-Do-not-dereference-NULL-argument-of-pcre_free_study.patch
 BuildRequires: readline-devel
 # New libtool to get rid of rpath
 BuildRequires: autoconf, automake, libtool
@@ -56,6 +58,7 @@ Utilities demonstrating PCRE capabilities like pcregrep or pcretest.
 libtoolize --copy --force && autoreconf
 %patch1 -p1 -b .terminated_typos
 %patch2 -p1 -b .unmatched_subpattern
+%patch3 -p1 -b .null_pcre_free_study
 # One contributor's name is non-UTF-8
 for F in ChangeLog; do
     iconv -f latin1 -t utf8 "$F" >"${F}.utf8"
@@ -128,6 +131,7 @@ make check
 %changelog
 * Mon Jan 02 2012 Petr Pisar <ppisar at redhat.com> - 8.21-2
 - Fix unmatched subpattern to not become wildcard (bug #769597)
+- Fix NULL pointer derefernce in pcre_free_study() (upstream bug #1186)
 
 * Mon Dec 12 2011 Petr Pisar <ppisar at redhat.com> - 8.21-1
 - 8.21 bump