From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 17 May 2016 01:42:54 +0000 (-0400)
Subject: Fix: illegal memory access in consumer_set_subdir
X-Git-Tag: v2.8.0~69
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=cc4e799a0507baa12c3fea83e4d9ee2f1f5fd27b;p=lttng-tools.git

Fix: illegal memory access in consumer_set_subdir

Found by Coverity:
CID 1243015 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)8. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array
consumer->subdir of size 4096 bytes might leave the destination string
unterminated.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/bin/lttng-sessiond/consumer.c b/src/bin/lttng-sessiond/consumer.c
index a8c5fb871..934af39bd 100644
--- a/src/bin/lttng-sessiond/consumer.c
+++ b/src/bin/lttng-sessiond/consumer.c
@@ -1089,7 +1089,11 @@ int consumer_set_subdir(struct consumer_output *consumer,
 		goto error;
 	}
 
-	strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir));
+	if (lttng_strncpy(consumer->subdir, tmp_path,
+			sizeof(consumer->subdir))) {
+		ret = -EINVAL;
+		goto error;
+	}
 	DBG2("Consumer subdir set to %s", consumer->subdir);
 
 error: