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spi: Add check for 8-bit transfer with 8 IO mode support

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commit 710505212e3272396394f8cf78e3ddfd05df3f22 upstream.

The current SPI framework does not verify if the SPI device supports
8 IO mode when doing an 8-bit transfer. This patch adds a check to
ensure that if the transfer tx_nbits or rx_nbits is 8, the SPI mode must
support 8 IO. If not, an error is returned, preventing undefined behavior.

Fixes: d6a711a898672 ("spi: Fix OCTAL mode support")
Cc: stable@vger.kernel.org
Signed-off-by: Cheng Ming Lin <chengminglin@mxic.com.tw>
Link: https://patch.msgid.link/20250714031023.504752-1-linchengming884@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Cheng Ming Lin
2025-07-14 11:10:23 +08:00
committed by Greg Kroah-Hartman
parent 415d4966cb
commit 82b29ee8ba
1 changed files with 10 additions and 4 deletions
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14
drivers/spi/spi.c
View File

@@ -4011,10 +4011,13 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
xfer->tx_nbits != SPI_NBITS_OCTAL)
return -EINVAL;
if ((xfer->tx_nbits == SPI_NBITS_DUAL) &&
!(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD)))
!(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD | SPI_TX_OCTAL)))
return -EINVAL;
if ((xfer->tx_nbits == SPI_NBITS_QUAD) &&
!(spi->mode & SPI_TX_QUAD))
!(spi->mode & (SPI_TX_QUAD | SPI_TX_OCTAL)))
return -EINVAL;
if ((xfer->tx_nbits == SPI_NBITS_OCTAL) &&
!(spi->mode & SPI_TX_OCTAL))
return -EINVAL;
}
/* Check transfer rx_nbits */
@@ -4027,10 +4030,13 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
xfer->rx_nbits != SPI_NBITS_OCTAL)
return -EINVAL;
if ((xfer->rx_nbits == SPI_NBITS_DUAL) &&
!(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD)))
!(spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD | SPI_RX_OCTAL)))
return -EINVAL;
if ((xfer->rx_nbits == SPI_NBITS_QUAD) &&
!(spi->mode & SPI_RX_QUAD))
!(spi->mode & (SPI_RX_QUAD | SPI_RX_OCTAL)))
return -EINVAL;
if ((xfer->rx_nbits == SPI_NBITS_OCTAL) &&
!(spi->mode & SPI_RX_OCTAL))
return -EINVAL;
}