linux-kernel - [PATCH] efi/tpm: return -EINVAL when determining tpm final events log size fails

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Message-Id: <20191014172145.9669-1-jsnitsel@redhat.com>
Date:   Mon, 14 Oct 2019 10:21:45 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-efi@...r.kernel.org, linux-integrity@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] efi/tpm: return -EINVAL when determining tpm final events log size fails

Currently nothing checks the return value of efi_tpm_eventlog_init,
but in case that changes in the future make sure an error is
returned when it fails to determine the tpm final events log
size.

Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc: linux-efi@...r.kernel.org
Cc: linux-integrity@...r.kernel.org
Fixes: e658c82be556 ("efi/tpm: Only set 'efi_tpm_final_log_size' after successful event log parsing")
Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
---
 drivers/firmware/efi/tpm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/firmware/efi/tpm.c b/drivers/firmware/efi/tpm.c
index ebd7977653a8..31f9f0e369b9 100644
--- a/drivers/firmware/efi/tpm.c
+++ b/drivers/firmware/efi/tpm.c
@@ -88,6 +88,7 @@ int __init efi_tpm_eventlog_init(void)
 
 	if (tbl_size < 0) {
 		pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n");
+		ret = -EINVAL;
 		goto out_calc;
 	}
 
-- 
2.23.0