[sheepdog] [PATCH 5/7] logger: check the return value of vsnprintf

[MORITA Kazutaka]

From: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>

Signed-off-by: MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>
---
 lib/logger.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/logger.c b/lib/logger.c
index 3d05995..8b59265 100644
--- a/lib/logger.c
+++ b/lib/logger.c
@@ -343,7 +343,11 @@ static void dolog(int prio, const char *func, int line,
 
 	gettimeofday(&tv, NULL);
 	len = vsnprintf(str, MAX_MSG_SIZE, fmt, ap);
-	msg->str_len = len;
+	if (len < 0) {
+		syslog(LOG_ERR, "vsnprintf failed");
+		return;
+	}
+	msg->str_len = min(len, MAX_MSG_SIZE - 1);
 
 	if (la) {
 		struct sembuf ops;
-- 
1.7.9.5