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 ace2cd6a6bc29bd460b3613422b4ff98a3d8e1f9..735aaef3d9f76383bbfa4caa32eac36f154c1fc7 100644 (file)
--- 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 */