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crypto: algif_hash - Allocate hash state with kmalloc

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Allocating the hash state on the stack limits its size.  Change
this to use kmalloc so the limit can be removed for new drivers.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-03-28 11:54:24 +08:00
parent 686cd976b6
commit acc03d8908
1 changed files with 15 additions and 4 deletions
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19
crypto/algif_hash.c
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@ -235,24 +235,31 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
struct ahash_request *req = &ctx->req;
char state[HASH_MAX_STATESIZE];
struct crypto_ahash *tfm;
struct sock *sk2;
struct alg_sock *ask2;
struct hash_ctx *ctx2;
char *state;
bool more;
int err;
tfm = crypto_ahash_reqtfm(req);
state = kmalloc(crypto_ahash_statesize(tfm), GFP_KERNEL);
err = -ENOMEM;
if (!state)
goto out;
lock_sock(sk);
more = ctx->more;
err = more ? crypto_ahash_export(req, state) : 0;
release_sock(sk);
if (err)
return err;
goto out_free_state;
err = af_alg_accept(ask->parent, newsock, kern);
if (err)
return err;
goto out_free_state;
sk2 = newsock->sk;
ask2 = alg_sk(sk2);
@ -260,7 +267,7 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
ctx2->more = more;
if (!more)
return err;
goto out_free_state;
err = crypto_ahash_import(&ctx2->req, state);
if (err) {
@ -268,6 +275,10 @@ static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
sock_put(sk2);
}
out_free_state:
kfree_sensitive(state);
out:
return err;
}