4.2.8-ckt7 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
commit 6454c2b83f719057069777132b13949e4c6b6350 upstream.
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.
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
[ kamal: backport to 4.2-stable: use ablkcipher ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
crypto/algif_skcipher.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 1939e60..42e497d 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_ablkcipher *tfm = crypto_ablkcipher_reqtfm(&ctx->req);
+ struct skcipher_tfm *skc = pask->private;
+ struct crypto_ablkcipher *tfm = skc->skcipher;
unsigned ivsize = crypto_ablkcipher_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 ablkcipher_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_ablkcipher_reqsize(tfm);
unsigned int ivsize = crypto_ablkcipher_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_ablkcipher_blocksize(crypto_ablkcipher_reqtfm(
- &ctx->req));
+ struct skcipher_tfm *skc = pask->private;
+ struct crypto_ablkcipher *tfm = skc->skcipher;
+ unsigned bs = crypto_ablkcipher_blocksize(tfm);
struct skcipher_sg_list *sgl;
struct scatterlist *sg;
int err = -EAGAIN;
--
2.7.4
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