From 7d9b62ae2a7db6dfa218999b7dd65517a6f9cfb7 Mon Sep 17 00:00:00 2001
From: David Kozub
Date: Thu, 14 Feb 2019 01:15:59 +0100
Subject: block: sed-opal: unify error handling of responses

response_get_{string,u64} include error handling for argument resp being
NULL but response_get_token does not handle this.

Make all three of response_get_{string,u64,token} handle NULL resp in
the same way.

Co-authored-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Signed-off-by: David Kozub <zub@linux.fjfi.cvut.cz>
Signed-off-by: Jonas Rabenstein <jonas.rabenstein@studium.uni-erlangen.de>
Reviewed-by: Scott Bauer <sbauer@plzdonthack.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 block/sed-opal.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/sed-opal.c b/block/sed-opal.c
index 0348fb896a5d..3f368b14efd9 100644
--- a/block/sed-opal.c
+++ b/block/sed-opal.c
@@ -696,6 +696,11 @@ static const struct opal_resp_tok *response_get_token(
 {
 	const struct opal_resp_tok *tok;
 
+	if (!resp) {
+		pr_debug("Response is NULL\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	if (n >= resp->num) {
 		pr_debug("Token number doesn't exist: %d, resp: %d\n",
 			 n, resp->num);
-- 
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