crypto: algif_hash - fix double free in hash_accept

jira VULN-70980
cve CVE-2025-38079
commit-author Ivan Pravdin <[email protected]>
commit b2df03e

If accept(2) is called on socket type algif_hash with
MSG_MORE flag set and crypto_ahash_import fails,
sk2 is freed. However, it is also freed in af_alg_release,
leading to slab-use-after-free error.

Fixes: fe869cd ("crypto: algif_hash - User-space interface for hash operations")
	Cc: <[email protected]>
	Signed-off-by: Ivan Pravdin <[email protected]>
	Signed-off-by: Herbert Xu <[email protected]>
(cherry picked from commit b2df03e)
	Signed-off-by: Marcin Wcisło <[email protected]>

Author: pvts-mat

crypto/algif_hash.c

@@ -263,10 +263,6 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
 		return err;
 
 	err = crypto_ahash_import(&ctx2->req, state);
-	if (err) {
-		sock_orphan(sk2);
-		sock_put(sk2);
-	}
 
 	return err;
 }