trusted-keys: check for NULL before using it

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@I-love.SAKURA.ne.jp>
Reviewed-by: Jesper Juhl <jj@chaosbits.net>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c
index 7b21795..f7d0677 100644 (file)
--- 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);