From: David Goulet <david.goulet@polymtl.ca>
Date: Thu, 25 Aug 2011 19:42:20 +0000 (-0400)
Subject: Add NULL pointer check
X-Git-Tag: v2.0-pre12~4
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=83009e5e25be5591c5a08e018e95a7d9baf7c108;p=lttng-tools.git

Add NULL pointer check

Signed-off-by: David Goulet <david.goulet@polymtl.ca>
---

diff --git a/liblttngctl/lttngctl.c b/liblttngctl/lttngctl.c
index b83d5ca92..b64ace2e6 100644
--- a/liblttngctl/lttngctl.c
+++ b/liblttngctl/lttngctl.c
@@ -343,6 +343,16 @@ static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
 		goto end;
 	}
 
+	/*
+	 * Extra protection not to dereference a NULL pointer. If buf is NULL at
+	 * this point, an error is returned and data is freed.
+	 */
+	if (buf == NULL) {
+		ret = -1;
+		free(data);
+		goto end;
+	}
+
 	*buf = data;
 	ret = size;