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

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: tpm_tis_spi: Account for SPI header when allocating TPM SPI xfer buffer 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.

References

• https://git.kernel.org/stable/c/1547183852dcdfcc25878db7dd3620509217b0cd
• https://git.kernel.org/stable/c/de13c56f99477b56980c7e00b09c776d16b7563d
• https://git.kernel.org/stable/c/195aba96b854dd664768f382cd1db375d8181f88