[PATCH 2/3] trusted-keys: check for NULL before using it

[Tetsuo Handa]

TSS_rawhmac() checks for data != NULL before using it.
We should do the same thing for TSS_authhmac().

Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
 security/keys/trusted_defined.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c
index 7b21795..f7d0677 100644
--- a/security/keys/trusted_defined.c
+++ b/security/keys/trusted_defined.c
@@ -148,6 +148,11 @@ static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
 		if (dlen == 0)
 			break;
 		data = va_arg(argp, unsigned char *);
+		if (!data) {
+			ret = -EINVAL;
+			va_end(argp);
+			goto out;
+		}
 		ret = crypto_shash_update(&sdesc->shash, data, dlen);
 		if (ret < 0) {
 			va_end(argp);
-- 
1.7.1

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