tpm_i2c_nuvoton: fix potential buffer overruns caused by bit glitches on the bus
Discrete TPMs are often connected over slow serial buses which, on some platforms, can have glitches causing bit flips. In all the driver _recv() functions, we need to use a u32 to unmarshal the response size, otherwise a bit flip of the 31st bit would cause the expected variable to go negative, which would then try to read a huge amount of data. Also sanity check that the expected amount of data is large enough for the TPM header. Signed-off-by: NJeremy Boone <jeremy.boone@nccgroup.trust> Cc: stable@vger.kernel.org Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: NJarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: NJames Morris <james.morris@microsoft.com>
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