staging: keucr: check kmalloc() return value

kmalloc() may fail, if so return error code.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/keucr/init.c

@@ -300,6 +300,8 @@ int ENE_LoadBinCode(struct us_data *us, BYTE flag)
 		return USB_STOR_TRANSPORT_GOOD;
 
 	buf = kmalloc(0x800, GFP_KERNEL);
+	if (buf == NULL)
+		return USB_STOR_TRANSPORT_ERROR;
 	switch ( flag )
 	{
 		// For SD

drivers/staging/keucr/msscsi.c

@@ -168,6 +168,8 @@ int MS_SCSI_Read(struct us_data *us, struct scsi_cmnd *srb)
 		DWORD	blkno;
 
 		buf = kmalloc(blenByte, GFP_KERNEL);
+		if (buf == NULL)
+			return USB_STOR_TRANSPORT_ERROR;
 
 		result = ENE_LoadBinCode(us, MS_RW_PATTERN);
 		if (result != USB_STOR_XFER_GOOD)
@@ -271,6 +273,8 @@ int MS_SCSI_Write(struct us_data *us, struct scsi_cmnd *srb)
 		WORD	len, oldphy, newphy;
 
 		buf = kmalloc(blenByte, GFP_KERNEL);
+		if (buf == NULL)
+			return USB_STOR_TRANSPORT_ERROR;
 		usb_stor_set_xfer_buf(us, buf, blenByte, srb, FROM_XFER_BUF);
 
 		result = ENE_LoadBinCode(us, MS_RW_PATTERN);

drivers/staging/keucr/smscsi.c

@@ -145,6 +145,8 @@ int SM_SCSI_Read(struct us_data *us, struct scsi_cmnd *srb)
 		return USB_STOR_TRANSPORT_ERROR;
 
 	buf = kmalloc(blenByte, GFP_KERNEL);
+	if (buf == NULL)
+		return USB_STOR_TRANSPORT_ERROR;
 	result = Media_D_ReadSector(us, bn, blen, buf);
 	usb_stor_set_xfer_buf(us, buf, blenByte, srb, TO_XFER_BUF);
 	kfree(buf);
@@ -175,6 +177,8 @@ int SM_SCSI_Write(struct us_data *us, struct scsi_cmnd *srb)
 		return USB_STOR_TRANSPORT_ERROR;
 
 	buf = kmalloc(blenByte, GFP_KERNEL);
+	if (buf == NULL)
+		return USB_STOR_TRANSPORT_ERROR;
 	usb_stor_set_xfer_buf(us, buf, blenByte, srb, FROM_XFER_BUF);
 	result = Media_D_CopySector(us, bn, blen, buf);
 	kfree(buf);