NFC: st-nci: Fix incorrect spi buffer size

When sending data over SPI, the maximum expected length is the maximum
nci packet payload + data header size + the frame head room (1 for the
ndlc header) + the frame trail room (0).

Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/nfc/st-nci/spi.c b/drivers/nfc/st-nci/spi.c
index 9a398713897fb5606e8241a40028063a87ff3d23..b43f448b8d7829850c798401e95ba2e4e3bb2ba8 100644 (file)
--- a/drivers/nfc/st-nci/spi.c
+++ b/drivers/nfc/st-nci/spi.c
@@ -25,6 +25,7 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/nfc.h>
+#include <net/nfc/nci.h>
 #include <linux/platform_data/st-nci.h>
 
 #include "st-nci.h"
@@ -94,7 +95,8 @@ static int st_nci_spi_write(void *phy_id, struct sk_buff *skb)
        struct st_nci_spi_phy *phy = phy_id;
        struct spi_device *dev = phy->spi_dev;
        struct sk_buff *skb_rx;
-       u8 buf[ST_NCI_SPI_MAX_SIZE];
+       u8 buf[ST_NCI_SPI_MAX_SIZE + NCI_DATA_HDR_SIZE +
+              ST_NCI_FRAME_HEADROOM + ST_NCI_FRAME_TAILROOM];
        struct spi_transfer spi_xfer = {
                .tx_buf = skb->data,
                .rx_buf = buf,