Re: [pcre-dev] AV in pcre_dfa_exe.c followed by application …

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著者: Christian Persch
日付:  
To: pcre-dev
題目: Re: [pcre-dev] AV in pcre_dfa_exe.c followed by application crash
Hi;

Am Tue, 14 May 2013 18:30:32 +0200
schrieb Ralf Junker <ralfjunker@???>:

> The following C code triggers an AV in pcre_dfa_exec(), followed by an
> application crash. I was unable to reproduce this with pcretest, but
> this C code triggers the problem reliably.


Attached patch fixes this.

Regards,
    Christian
From 874c77520e81f88600df487914c8e2bc51c6831a Mon Sep 17 00:00:00 2001
From: Christian Persch <chpe@???>
Date: Wed, 15 May 2013 14:24:58 +0200
Subject: [PATCH] dfa: Fix invalid read

---
 pcre_dfa_exec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pcre_dfa_exec.c b/pcre_dfa_exec.c
index 8211760..0fe10b5 100644
--- a/pcre_dfa_exec.c
+++ b/pcre_dfa_exec.c
@@ -636,7 +636,7 @@ for (;;)
     const pcre_uchar *code;
     int state_offset = current_state->offset;
     int codevalue, rrc;
-    unsigned int count;
+    int count;
 
 #ifdef PCRE_DEBUG
     printf ("%.*sProcessing state %d c=", rlevel*2-2, SP, state_offset);
-- 
1.7.12.503.g5976753.dirty