Josh Zimmerman 26a137e31f
tpm_tis: Check return values from get_burstcount. ...
If the TPM we're connecting to uses a static burst count, it will report
a burst count of zero throughout the response read. However, get_burstcount
assumes that a response of zero indicates that the TPM is not ready to
receive more data. In this case, it returns a negative error code, which
is passed on to tpm_tis_{write,read}_bytes as a u16, causing
them to read/write far too many bytes.
This patch checks for negative return codes and bails out from recv_data
and tpm_tis_send_data.
Cc: stable@vger.kernel.org
Fixes: 1107d065fdjoshz@google.com >
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com >
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com >
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