From b289b1882031a0fbcb6a1d0c702fba88ec85acf4 Mon Sep 17 00:00:00 2001
From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Sat, 13 Jul 2019 00:10:32 +0200
Subject: [PATCH] Check regex_match result when parsing cvslog

Spotted by coverity.
---
 src/VCBackend.cpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/VCBackend.cpp b/src/VCBackend.cpp
index 957c69f585..3a4ecb4f05 100644
--- a/src/VCBackend.cpp
+++ b/src/VCBackend.cpp
@@ -734,12 +734,14 @@ void CVS::getRevisionInfo()
 		LYXERR(Debug::LYXVC, line << '\n');
 		if (prefixIs(line, "date:")) {
 			smatch sm;
-			regex_match(line, sm, reg);
-			//sm[0]; // whole matched string
-			rev_date_cache_ = sm[1];
-			rev_time_cache_ = sm[2];
-			//sm[3]; // GMT offset
-			rev_author_cache_ = sm[4];
+			if (regex_match(line, sm, reg)) {
+			  //sm[0]; // whole matched string
+			  rev_date_cache_ = sm[1];
+			  rev_time_cache_ = sm[2];
+			  //sm[3]; // GMT offset
+			  rev_author_cache_ = sm[4];
+			} else
+			  LYXERR(Debug::LYXVC, "\tCannot parse line. Skipping."); 
 			break;
 		}
 	}
-- 
2.39.5