openat: fail with ENOENT on empty name

* lib/openat-proc.c (openat_proc_name): Special-case the empty
buffer.

Signed-off-by: Eric Blake <ebb9@byu.net>

diff --git a/ChangeLog b/ChangeLog
index 193ec7f196af203508fe16bde193c1b881d38d07..ecbf16e27fe604e36887e02288bbe361488ea452 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2009-09-04  Eric Blake  <ebb9@byu.net>
 
+       openat: fail with ENOENT on empty name
+       * lib/openat-proc.c (openat_proc_name): Special-case the empty
+       buffer.
+
        link-follow: fix logic bug in prior patch
        * m4/link-follow.m4 (gl_FUNC_LINK_FOLLOWS_SYMLINK): Fix bug that
        reversed sense of yes and no in prior patch.  Avoid confusing

diff --git a/lib/openat-proc.c b/lib/openat-proc.c
index 8057033e86071291ec7c94fcff1a7820874eb827..76e1c6dd514ef549c245c840663af51374c5a9b6 100644 (file)
--- a/lib/openat-proc.c
+++ b/lib/openat-proc.c
@@ -57,6 +57,13 @@ openat_proc_name (char buf[OPENAT_BUFFER_SIZE], int fd, char const *file)
 {
   static int proc_status = 0;
 
+  /* Make sure the caller gets ENOENT when appropriate.  */
+  if (!*file)
+    {
+      buf[0] = '\0';
+      return buf;
+    }
+
   if (! proc_status)
     {
       /* Set PROC_STATUS to a positive value if /proc/self/fd is