From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Mon, 3 Oct 2016 20:06:23 +0000 (+0200)
Subject: rev: Avoid out of boundary read
X-Git-Tag: v2.29-rc2~15
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b56b13684e01ab56738e602b35a2c133e8f9b92a;p=thirdparty%2Futil-linux.git

rev: Avoid out of boundary read

Check if the length of the parsed string is at least 1,
otherwise an out of boundary read would occur.
---

diff --git a/text-utils/rev.c b/text-utils/rev.c
index ace2cd6a6b..735aaef3d9 100644
--- a/text-utils/rev.c
+++ b/text-utils/rev.c
@@ -149,6 +149,9 @@ int main(int argc, char *argv[])
 		while (fgetws(buf, bufsiz, fp)) {
 			len = wcslen(buf);
 
+			if (len == 0)
+				continue;
+
 			/* This is my hack from setpwnam.c -janl */
 			while (buf[len-1] != '\n' && !feof(fp)) {
 				/* Extend input buffer if it failed getting the whole line */