From: Tobias Schramm <tobleminer@gmail.com>
Date: Sun, 18 Feb 2018 12:46:04 +0000 (+0100)
Subject: uclient-fetch: Check for nullpointer returned by uclient_get_url_filename
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fuclient.git;a=commitdiff_plain;h=9fd8070c6395ee0ab6b5a7c0d98c370ce0847553

uclient-fetch: Check for nullpointer returned by uclient_get_url_filename

uclient_get_url_filename may return a null ptr resulting in a null
ptr dereference by fprintf and open

Signed-off-by: Tobias Schramm <tobleminer@gmail.com>
---

diff --git a/uclient-fetch.c b/uclient-fetch.c
index 6961d94..38c9c53 100644
--- a/uclient-fetch.c
+++ b/uclient-fetch.c
@@ -122,6 +122,11 @@ static int open_output_file(const char *path, uint64_t resume_offset)
 		}
 	} else {
 		filename = uclient_get_url_filename(path, "index.html");
+		if (!filename) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
 		output_file = filename;
 	}
 
@@ -151,6 +156,7 @@ done:
 
 free:
 	free(filename);
+out:
 	return ret;
 }