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crypto: algif_hash - fix double free in hash_accept

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commit b2df03ed4052e97126267e8c13ad4204ea6ba9b6 upstream.

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: fe869cdb89 ("crypto: algif_hash - User-space interface for hash operations")
Cc: <stable@vger.kernel.org>
Signed-off-by: Ivan Pravdin <ipravdin.official@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ivan Pravdin 2025-05-18 18:41:02 -04:00 committed by Greg Kroah-Hartman
parent 3cb003b959
commit f0f3d09f53
1 changed files with 0 additions and 4 deletions
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4
crypto/algif_hash.c
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@ -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;
}