Commit 36a11029 authored by Ricardo Schwarzmeier's avatar Ricardo Schwarzmeier Committed by Jarkko Sakkinen
Browse files

tpm: Return the actual size when receiving an unsupported command

The userpace expects to read the number of bytes stated in the header.
Returning the size of the buffer instead would be unexpected.

Fixes: 095531f8

 ("tpm: return a TPM_RC_COMMAND_CODE response if command is not implemented")
Signed-off-by: default avatarRicardo Schwarzmeier <>
Reviewed-by: default avatarJarkko Sakkinen <>
Signed-off-by: default avatarJarkko Sakkinen <>
parent 627448e8
......@@ -450,7 +450,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
return bufsiz;
return sizeof(*header);
if (bufsiz > TPM_BUFSIZE)
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