[rtems commit] dosfs: Ensure valid data cluster count

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    0c9b35e8dd1837ece019318a9ea9199e970e74a1
Changeset: http://git.rtems.org/rtems/commit/?id=0c9b35e8dd1837ece019318a9ea9199e970e74a1

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Fri Feb 15 16:52:05 2013 +0100

dosfs: Ensure valid data cluster count

---

 cpukit/libfs/src/dosfs/fat.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/cpukit/libfs/src/dosfs/fat.c b/cpukit/libfs/src/dosfs/fat.c
index 8e9da21..b2b55c0 100644
--- a/cpukit/libfs/src/dosfs/fat.c
+++ b/cpukit/libfs/src/dosfs/fat.c
@@ -652,12 +652,17 @@ fat_init_volume_info(fat_fs_info_t *fs_info, const char *device)
             vol->mask = FAT_FAT16_MASK;
             vol->eoc_val = FAT_FAT16_EOC;
         }
-        else
+        else if ( vol->data_cls < FAT_FAT32_MASK - 1 )
         {
             vol->type = FAT_FAT32;
             vol->mask = FAT_FAT32_MASK;
             vol->eoc_val = FAT_FAT32_EOC;
         }
+        else
+        {
+            close(vol->fd);
+            rtems_set_errno_and_return_minus_one( EINVAL );
+        }
     }
 
     if (vol->type == FAT_FAT32)