The patch below does not apply to the 3.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 6454c2b83f719057069777132b13949e4c6b6350 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 3 Feb 2016 21:39:26 +0800
Subject: [PATCH] crypto: algif_skcipher - Do not dereference ctx without
socket lock
Any access to non-constant bits of the private context must be
done under the socket lock, in particular, this includes ctx->req.
This patch moves such accesses under the lock, and fetches the
tfm from the parent socket which is guaranteed to be constant,
rather than from ctx->req.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index ec07a864b9c5..ef84353e0f24 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -295,8 +295,11 @@ static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
+ struct sock *psk = ask->parent;
+ struct alg_sock *pask = alg_sk(psk);
struct skcipher_ctx *ctx = ask->private;
- struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(&ctx->req);
+ struct skcipher_tfm *skc = pask->private;
+ struct crypto_skcipher *tfm = skc->skcipher;
unsigned ivsize = crypto_skcipher_ivsize(tfm);
struct skcipher_sg_list *sgl;
struct af_alg_control con = {};
@@ -508,7 +511,7 @@ static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg,
struct skcipher_async_req *sreq;
struct skcipher_request *req;
struct skcipher_async_rsgl *last_rsgl = NULL;
- unsigned int txbufs = 0, len = 0, tx_nents = skcipher_all_sg_nents(ctx);
+ unsigned int txbufs = 0, len = 0, tx_nents;
unsigned int reqsize = crypto_skcipher_reqsize(tfm);
unsigned int ivsize = crypto_skcipher_ivsize(tfm);
int err = -ENOMEM;
@@ -526,6 +529,7 @@ static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg,
sreq->inflight = &ctx->inflight;
lock_sock(sk);
+ tx_nents = skcipher_all_sg_nents(ctx);
sreq->tsg = kcalloc(tx_nents, sizeof(*sg), GFP_KERNEL);
if (unlikely(!sreq->tsg))
goto unlock;
@@ -633,9 +637,12 @@ static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
+ struct sock *psk = ask->parent;
+ struct alg_sock *pask = alg_sk(psk);
struct skcipher_ctx *ctx = ask->private;
- unsigned bs = crypto_skcipher_blocksize(crypto_skcipher_reqtfm(
- &ctx->req));
+ struct skcipher_tfm *skc = pask->private;
+ struct crypto_skcipher *tfm = skc->skcipher;
+ unsigned bs = crypto_skcipher_blocksize(tfm);
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
int err = -EAGAIN;
--
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