Messages in this thread Patch in this message | | | From | Michael Thalmeier <> | Subject | [PATCH] spi: detect wrong transfer->len values | Date | Fri, 23 Sep 2011 13:59:18 +0200 |
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From: Helmut Raiger <helmut.raiger@hale.at>
Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at> --- drivers/spi/spi.c | 12 +++++++++++- 1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 4d1b9f5..70adac3 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -760,6 +760,17 @@ EXPORT_SYMBOL_GPL(spi_setup); static int __spi_async(struct spi_device *spi, struct spi_message *message) { struct spi_master *master = spi->master; + struct spi_transfer *xfer; + + /* check if number of bytes relates to bits per word mode */ + list_for_each_entry(xfer, &message->transfers, transfer_list) { + u8 bpw = xfer->bits_per_word ? + xfer->bits_per_word : spi->bits_per_word; + + if ((bpw == 16 && (xfer->len & 1)) || + (bpw == 32 && (xfer->len & 3))) + return -EINVAL; + } /* Half-duplex links include original MicroWire, and ones with * only one data pin like SPI_3WIRE (switches direction) or where @@ -768,7 +779,6 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message) */ if ((master->flags & SPI_MASTER_HALF_DUPLEX) || (spi->mode & SPI_3WIRE)) { - struct spi_transfer *xfer; unsigned flags = master->flags; list_for_each_entry(xfer, &message->transfers, transfer_list) { -- 1.7.6.2
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