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authorRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>2015-02-02 13:06:56 +0300
committerMark Brown <broonie@kernel.org>2015-02-02 15:17:19 +0300
commit34093cb97abe9298a19a96b1b2f1714e28f8e67f (patch)
tree8d516008ea9cde7c6e2de5519bbbc913a85bf703 /drivers/spi/spi-xilinx.c
parent0635287a308d38bad334fe91ea5a69b597e0a583 (diff)
downloadlinux-34093cb97abe9298a19a96b1b2f1714e28f8e67f.tar.xz
spi/xilinx: Fix access invalid memory on xilinx_spi_tx
On 1 and 2 bytes per word, the transfer of the 3 last bytes will access memory outside tx_ptr. Although this has not trigger any error on real hardware, we should better fix this. Fixes: 24ba5e593f391507 (Remove rx_fn and tx_fn pointer) Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-xilinx.c')
-rw-r--r--drivers/spi/spi-xilinx.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c
index d1901d578823..133f53a9c1d4 100644
--- a/drivers/spi/spi-xilinx.c
+++ b/drivers/spi/spi-xilinx.c
@@ -117,11 +117,26 @@ static unsigned int xspi_read32_be(void __iomem *addr)
static void xilinx_spi_tx(struct xilinx_spi *xspi)
{
+ u32 data = 0;
+
if (!xspi->tx_ptr) {
xspi->write_fn(0, xspi->regs + XSPI_TXD_OFFSET);
return;
}
- xspi->write_fn(*(u32 *)(xspi->tx_ptr), xspi->regs + XSPI_TXD_OFFSET);
+
+ switch (xspi->bytes_per_word) {
+ case 1:
+ data = *(u8 *)(xspi->tx_ptr);
+ break;
+ case 2:
+ data = *(u16 *)(xspi->tx_ptr);
+ break;
+ case 4:
+ data = *(u32 *)(xspi->tx_ptr);
+ break;
+ }
+
+ xspi->write_fn(data, xspi->regs + XSPI_TXD_OFFSET);
xspi->tx_ptr += xspi->bytes_per_word;
}