From ec01c407ff9691ccdc641c2e322e1c88cfa8a644 Mon Sep 17 00:00:00 2001
From: Sascha Wildner <saw@online.de>
Date: Fri, 16 Oct 2015 09:28:54 +0200
Subject: [PATCH] libc/regex: Fix a reference of an uninitialized variable.

If tre_bt_mem_alloc() fails, xfree() would have been called on an
uninitialized 'buf' variable.
---
 contrib/tre/lib/tre-match-backtrack.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/contrib/tre/lib/tre-match-backtrack.c b/contrib/tre/lib/tre-match-backtrack.c
index 726c4c01fb..24ed48cfda 100644
--- a/contrib/tre/lib/tre-match-backtrack.c
+++ b/contrib/tre/lib/tre-match-backtrack.c
@@ -257,6 +257,9 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
 #ifdef TRE_MBSTATE
   memset(&mbstate, '\0', sizeof(mbstate));
 #endif /* TRE_MBSTATE */
+#ifndef TRE_USE_ALLOCA
+  buf = NULL;
+#endif
 
   if (!mem)
     return REG_ESPACE;
-- 
2.41.0