diff options
| -rw-r--r-- | FatPkg/EnhancedFatDxe/Init.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/FatPkg/EnhancedFatDxe/Init.c b/FatPkg/EnhancedFatDxe/Init.c index 3a946199e7..8563b950a4 100644 --- a/FatPkg/EnhancedFatDxe/Init.c +++ b/FatPkg/EnhancedFatDxe/Init.c @@ -61,6 +61,30 @@ FatAllocateVolume ( //
Volume->RootDirEnt.FileString = Volume->RootFileString;
Volume->RootDirEnt.Entry.Attributes = FAT_ATTRIBUTE_DIRECTORY;
+
+ //
+ // Check to see if the underlying block device's BlockSize meets what the FAT spec requires
+ //
+ if ((BlockIo == NULL) || (BlockIo->Media == NULL)) {
+ DEBUG ((DEBUG_ERROR, "%a BlockIo or BlockIo is NULL!\n", __func__));
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
+
+ if ((BlockIo->Media->BlockSize > (1 << MAX_BLOCK_ALIGNMENT)) ||
+ (BlockIo->Media->BlockSize < (1 << MIN_BLOCK_ALIGNMENT)))
+ {
+ Status = EFI_UNSUPPORTED;
+ DEBUG ((
+ DEBUG_ERROR,
+ "%a invalid BlockIo BlockSize %u for FAT filesystem on MediaId %u. Min 512b, max 4kb\n",
+ __func__,
+ BlockIo->Media->BlockSize,
+ BlockIo->Media->MediaId
+ ));
+ goto Done;
+ }
+
//
// Check to see if there's a file system on the volume
//
|