[rtems commit] dosfs: Fix read from invalid memory area

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    39840438bb3c29a0b890745f490a350a84470b75
Changeset: http://git.rtems.org/rtems/commit/?id=39840438bb3c29a0b890745f490a350a84470b75

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Fri May 16 15:34:33 2014 +0200

dosfs: Fix read from invalid memory area

---

 cpukit/libfs/src/dosfs/msdos_conv.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/cpukit/libfs/src/dosfs/msdos_conv.c b/cpukit/libfs/src/dosfs/msdos_conv.c
index 7e688ef..b391717 100644
--- a/cpukit/libfs/src/dosfs/msdos_conv.c
+++ b/cpukit/libfs/src/dosfs/msdos_conv.c
@@ -631,7 +631,7 @@ msdos_filename_utf8_to_short_name_for_save (
          * Strip any further characters up to a '.' or the end of the
          * string.
          */
-        if ( *name_ptr == '.' ) {
+        if ( name_size > 0 && *name_ptr == '.' ) {
           ++name_ptr;
           --name_size;
         }