tpm-fixup-pcrs-sysfs-file-update

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Debora Velarde <debora@linux.vnet.ibm.com>
Cc: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Cc: Marcel Selhorst <m.selhorst@sirrix.com>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index b0603b2e5684..1f32b520ca26 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -742,7 +742,7 @@ EXPORT_SYMBOL_GPL(tpm_pcr_read);
  * the module usage count.
  */
 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
-#define EXTEND_PCR_SIZE 34
+#define EXTEND_PCR_RESULT_SIZE 34
 static struct tpm_input_header pcrextend_header = {
         .tag = TPM_TAG_RQU_COMMAND,
         .length = cpu_to_be32(34),
@@ -760,10 +760,9 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
                 return -ENODEV;
 
         cmd.header.in = pcrextend_header;
-        BUILD_BUG_ON(be32_to_cpu(cmd.header.in.length) > EXTEND_PCR_SIZE);
         cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
         memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
-        rc = transmit_cmd(chip, &cmd, cmd.header.in.length,
+        rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
                           "attempting extend a PCR value");
 
         module_put(chip->dev->driver->owner);