linux-kernel - [PATCH] dm-crypt: fix incorrect use of strcmp when telling if there is no key

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Date:   Mon,  7 Nov 2022 20:22:33 +0800
From:   Coiby Xu <coxu@...hat.com>
To:     dm-devel@...hat.com
Cc:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>,
        Milan Broz <mbroz@...hat.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] dm-crypt: fix incorrect use of strcmp when telling if there is no key

strcmp returns 0 when two strings are equal.

Fixes: 69a8cfcda210 ("dm crypt: set key size early")
Signed-off-by: Coiby Xu <coxu@...hat.com>
---
 drivers/md/dm-crypt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 159c6806c19b..cfefe0f18150 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2590,7 +2590,7 @@ static int crypt_set_key(struct crypt_config *cc, char *key)
 	int key_string_len = strlen(key);
 
 	/* Hyphen (which gives a key_size of zero) means there is no key. */
-	if (!cc->key_size && strcmp(key, "-"))
+	if (!cc->key_size && !strcmp(key, "-"))
 		goto out;
 
 	/* ':' means the key is in kernel keyring, short-circuit normal key processing */
-- 
2.38.1