linux-kernel - [PATCH] crypto: algif_hash - fix double free in hash

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Message-ID: <20250518224102.478904-1-ipravdin.official@gmail.com>
Date: Sun, 18 May 2025 18:41:02 -0400
From: Ivan Pravdin <ipravdin.official@...il.com>
To: herbert@...dor.apana.org.au,
	davem@...emloft.net
Cc: linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ivan Pravdin <ipravdin.official@...il.com>
Subject: [PATCH] crypto: algif_hash - fix double free in hash_accept

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: fe869cdb89c9 ("crypto: algif_hash - User-space interface for hash operations")
Signed-off-by: Ivan Pravdin <ipravdin.official@...il.com>
---
 crypto/algif_hash.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 5498a87249d3..e3f1a4852737 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -265,10 +265,6 @@ static int hash_accept(struct socket *sock, struct socket *newsock,
 		goto out_free_state;
 
 	err = crypto_ahash_import(&ctx2->req, state);
-	if (err) {
-		sock_orphan(sk2);
-		sock_put(sk2);
-	}
 
 out_free_state:
 	kfree_sensitive(state);
-- 
2.45.2