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spi: Ensure that sg_table won't be used after being freed

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SPI code checks for non-zero sgt->orig_nents to determine if the buffer
has been DMA-mapped. Ensure that sg_table is really zeroed after free to
avoid potential NULL pointer dereference if the given SPI xfer object is
reused again without being DMA-mapped.

Fixes: 0c17ba73c0 ("spi: Fix cache corruption due to DMA/PIO overlap")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20220930113408.19720-1-m.szyprowski@samsung.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Marek Szyprowski 2022-09-30 13:34:08 +02:00 committed by Mark Brown
parent 28366dd2ec
commit 8e9204cddc
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1 changed files with 2 additions and 0 deletions
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drivers/spi/spi.c
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@ -1102,6 +1102,8 @@ static void spi_unmap_buf_attrs(struct spi_controller *ctlr,
if (sgt->orig_nents) {
dma_unmap_sgtable(dev, sgt, dir, attrs);
sg_free_table(sgt);
sgt->orig_nents = 0;
sgt->nents = 0;
}
}