[PATCH] fix segfault with invalid time structures

[Mike Frysinger]

From: Harald van Dijk <truedfx at gentoo.org>

If you strace a function that makes an invalid call with a time structure
set to NULL, strace will bomb.

Signed-off-by: Harald van Dijk <truedfx at gentoo.org>
Signed-off-by: Mike Frysinger <vapier at gentoo.org>
---
 file.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/file.c b/file.c
index b299961..316fde9 100644
--- a/file.c
+++ b/file.c
@@ -687,9 +687,13 @@ time_t t;
 		return buf;
 	}
 	tmp = localtime(&t);
-	sprintf(buf, "%02d/%02d/%02d-%02d:%02d:%02d",
-		tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday,
-		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+	if (tmp == NULL)
+		snprintf(buf, sizeof buf, "%lu",
+			(unsigned long) t);
+	else
+		sprintf(buf, "%02d/%02d/%02d-%02d:%02d:%02d",
+			tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday,
+			tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
 	return buf;
 }
 
-- 
1.5.5