diff --git a/drivers/filesystems/ffs/src/block.c b/drivers/filesystems/ffs/src/block.c
index 8507695974..7ab5ff24a5 100644
--- a/drivers/filesystems/ffs/src/block.c
+++ b/drivers/filesystems/ffs/src/block.c
@@ -463,6 +463,9 @@ FFSReadDisk(
 	Length = (ULONG)(Size + Offset + SECTOR_SIZE - 1 - Lba) &
 		(~((ULONG)SECTOR_SIZE - 1));
 
+    if (!Length)
+        return NT_SUCCESS;
+
 	Buf = ExAllocatePoolWithTag(PagedPool, Length, FFS_POOL_TAG);
 	if (!Buf)
 	{
diff --git a/drivers/filesystems/reiserfs/src/blockio.c b/drivers/filesystems/reiserfs/src/blockio.c
index befe4136a5..80c94921c4 100644
--- a/drivers/filesystems/reiserfs/src/blockio.c
+++ b/drivers/filesystems/reiserfs/src/blockio.c
@@ -455,6 +455,9 @@ RfsdReadDisk(
     Length = (ULONG)(Size + Offset + SECTOR_SIZE - 1 - Lba) &
              (~((ULONG)SECTOR_SIZE - 1));
 
+    if (!Length)
+        return NT_SUCCESS;
+
 	// Allocate a temporary buffer to read the sector-aligned data into
     Buf = ExAllocatePoolWithTag(PagedPool, Length, RFSD_POOL_TAG);
     if (!Buf) {