tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer

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The TPM SPI transfer mechanism uses MAX_SPI_FRAMESIZE for computing the
maximum transfer length and the size of the transfer buffer. As such, it
does not account for the 4 bytes of header that prepends the SPI data
frame. This can result in out-of-bounds accesses and was confirmed with
KASAN.

Introduce SPI_HDRSIZE to account for the header and use to allocate the
transfer buffer.

Fixes: a86a42ac2b ("tpm_tis_spi: Add hardware wait polling")
Signed-off-by: Matthew R. Ochs <mochs@nvidia.com>
Tested-by: Carol Soto <csoto@nvidia.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

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Matthew R. Ochs 2024-05-22 15:06:40 +03:00 • committed by Jarkko Sakkinen

parent 2bfcfd584f

commit 195aba96b8

1 changed files with 2 additions and 1 deletions

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drivers/char/tpm/tpm_tis_spi_main.c

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