linux-kernel - [PATCH 3.16 58/72] crypto: user - fix memory leak in crypto

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Date:   Sun, 08 Dec 2019 13:53:42 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Navid Emamdoost" <navid.emamdoost@...il.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>
Subject: [PATCH 3.16 58/72] crypto: user - fix memory leak in crypto_report

3.16.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Navid Emamdoost <navid.emamdoost@...il.com>

commit ffdde5932042600c6807d46c1550b28b0db6a3bc upstream.

In crypto_report, a new skb is created via nlmsg_new(). This skb should
be released if crypto_report_alg() fails.

Fixes: a38f7907b926 ("crypto: Add userspace configuration API")
Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 crypto/crypto_user.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -230,8 +230,10 @@ static int crypto_report(struct sk_buff
 drop_alg:
 	crypto_mod_put(alg);
 
-	if (err)
+	if (err) {
+		kfree_skb(skb);
 		return err;
+	}
 
 	return nlmsg_unicast(crypto_nlsk, skb, NETLINK_CB(in_skb).portid);
 }