[PATCH] ima-evm-utils: check the return code from tpm_pcr_read() in ima_measurement()

[George Wilson <gcwilson@xxxxxxxxxxxxx>]

Don't log garbage when neither /sys/class/tpm/tpm0/device/pcrs nor
/sys/class/misc/tpm0/device/pcrs can be read and exit nicely with a
value of 1.

Signed-off-by: George Wilson <gcwilson@xxxxxxxxxxxxx>
---
 src/evmctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/evmctl.c b/src/evmctl.c
index 2ffee78..a5c6221 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -1514,7 +1514,8 @@ static int ima_measurement(const char *file)
 		log_info("PCRAgg %.2d: ", i);
 		log_dump(pcr[i], SHA_DIGEST_LENGTH);
 
-		tpm_pcr_read(i, hwpcr, sizeof(hwpcr));
+		if (tpm_pcr_read(i, hwpcr, sizeof(hwpcr)))
+			exit(1);
 		log_info("HW PCR-%d: ", i);
 		log_dump(hwpcr, sizeof(hwpcr));
 
-- 
2.17.0.582.gccdcbd5