From: Jonathan Corbet <corbet@lwn.net>
Date: Tue, 1 Nov 2011 22:15:16 +0000 (+1100)
Subject: crypto: user - Fix rwsem leak in crypto_user
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fb223c32b4d3ee593c8dce07e983680d06abe387;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

crypto: user - Fix rwsem leak in crypto_user

The list_empty case in crypto_alg_match() will return without calling
up_read() on crypto_alg_sem.  We could do the "goto out" routine, but the
function will clearly do the right thing with that test simply removed.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 2abca780312d..0605a2bbba75 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -44,9 +44,6 @@ static struct crypto_alg *crypto_alg_match(struct crypto_user_alg *p, int exact)
 
 	down_read(&crypto_alg_sem);
 
-	if (list_empty(&crypto_alg_list))
-		return NULL;
-
 	list_for_each_entry(q, &crypto_alg_list, cra_list) {
 		int match = 0;