From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Mon, 20 Aug 2018 20:45:09 +0000 (-0400)
Subject: Fix: possible NULL dereference in uri_parse_str_urls()
X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=commitdiff_plain;h=254bb8042a859c26e7646e38d9941884476c547d

Fix: possible NULL dereference in uri_parse_str_urls()

The data_url parsing of uri_parse_str_urls assumes that a ctrl
URL was provided to check that both URLs point to the same
destination. A check for 'ctrl_uris != NULL' is added, but this
function needs to be refactored at some point at it is not clear
what its role is (i.e. it's probably doing too much).

Reported-by: Coverity Scan (1378214 Explicit null dereferenced)
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/common/uri.c b/src/common/uri.c
index 380e75dd3..64437272b 100644
--- a/src/common/uri.c
+++ b/src/common/uri.c
@@ -644,10 +644,12 @@ ssize_t uri_parse_str_urls(const char *ctrl_url, const char *data_url,
 
 		set_default_uri_attr(&data_uris[0], LTTNG_STREAM_DATA);
 
-		ret = compare_destination(&ctrl_uris[0], &data_uris[0]);
-		if (ret != 0) {
-			ERR("Control and data destination mismatch");
-			goto error;
+		if (ctrl_uris) {
+			ret = compare_destination(&ctrl_uris[0], &data_uris[0]);
+			if (ret != 0) {
+				ERR("Control and data destination mismatch");
+				goto error;
+			}
 		}
 	}