X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fcompare.c;h=7ed455848791cd40433dd52aea4b17155e970b3b;hb=3828942550fba1f88136ffbc018a72bdeb930902;hp=3bd0f07e0d0671409ff2fb556e2f6be4427c22ee;hpb=481572c63f5a259f1338a1b74e2dee304bd0df0b;p=chaz%2Ftar

diff --git a/src/compare.c b/src/compare.c
index 3bd0f07..7ed4558 100644
--- a/src/compare.c
+++ b/src/compare.c
@@ -1,7 +1,7 @@
 /* Diff files from a tar archive.
 
    Copyright 1988, 1992-1994, 1996-1997, 1999-2001, 2003-2007,
-   2009-2010, 2012-2013 Free Software Foundation, Inc.
+   2009-2010, 2012-2014 Free Software Foundation, Inc.
 
    This file is part of GNU tar.
 
@@ -270,11 +270,12 @@ diff_link (void)
 static void
 diff_symlink (void)
 {
+  char buf[1024];
   size_t len = strlen (current_stat_info.link_name);
-  char *linkbuf = alloca (len + 1);
+  char *linkbuf = len < sizeof buf ? buf : xmalloc (len + 1);
 
-  int status = readlinkat (chdir_fd, current_stat_info.file_name,
-			   linkbuf, len + 1);
+  ssize_t status = readlinkat (chdir_fd, current_stat_info.file_name,
+			       linkbuf, len + 1);
 
   if (status < 0)
     {
@@ -285,8 +286,11 @@ diff_symlink (void)
       report_difference (&current_stat_info, NULL);
     }
   else if (status != len
-	   || strncmp (current_stat_info.link_name, linkbuf, len) != 0)
+	   || memcmp (current_stat_info.link_name, linkbuf, len) != 0)
     report_difference (&current_stat_info, _("Symlink differs"));
+
+  if (linkbuf != buf)
+    free (linkbuf);
 }
 #endif