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tpm: fix error return code in tpm2_get_cc_attrs_tbl()

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commit 1df83992d977355177810c2b711afc30546c81ce upstream.

If the total number of commands queried through TPM2_CAP_COMMANDS is
different from that queried through TPM2_CC_GET_CAPABILITY, it indicates
an unknown error. In this case, an appropriate error code -EFAULT should
be returned. However, we currently do not explicitly assign this error
code to 'rc'. As a result, 0 was incorrectly returned.

Cc: stable@vger.kernel.org
Fixes: 58472f5cd4f6("tpm: validate TPM 2.0 commands")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhen Lei 2021-05-12 21:39:26 +08:00 committed by Greg Kroah-Hartman
parent 31c9a4b24d
commit 8fe5a45918
1 changed files with 1 additions and 0 deletions
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1
drivers/char/tpm/tpm2-cmd.c
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@ -656,6 +656,7 @@ int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip)
if (nr_commands !=
be32_to_cpup((__be32 *)&buf.data[TPM_HEADER_SIZE + 5])) {
rc = -EFAULT;
tpm_buf_destroy(&buf);
goto out;
}