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Date:   Mon, 20 Jan 2020 17:38:04 +0300
From:   Dan Carpenter <dan.carpenter@oracle.com>
To:     Neil Horman <nhorman@tuxdriver.com>,
        Corentin Labbe <clabbe@baylibre.com>
Cc:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        linux-crypto@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] crypto: rng - Fix a refcounting bug in crypto_rng_reset()
Message-ID: <20200120143804.pbmnrh72v2gogx43@kili.mountain>
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We need to decrement this refcounter on these error paths.

Fixes: f7d76e05d058 ("crypto: user - fix use_after_free of struct xxx_request")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 crypto/rng.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/crypto/rng.c b/crypto/rng.c
index 1e21231f71c9..1490d210f1a1 100644
--- a/crypto/rng.c
+++ b/crypto/rng.c
@@ -37,12 +37,16 @@ int crypto_rng_reset(struct crypto_rng *tfm, const u8 *seed, unsigned int slen)
 	crypto_stats_get(alg);
 	if (!seed && slen) {
 		buf = kmalloc(slen, GFP_KERNEL);
-		if (!buf)
+		if (!buf) {
+			crypto_alg_put(alg);
 			return -ENOMEM;
+		}
 
 		err = get_random_bytes_wait(buf, slen);
-		if (err)
+		if (err) {
+			crypto_alg_put(alg);
 			goto out;
+		}
 		seed = buf;
 	}
 
-- 
2.11.0