crypto: api - Add scaffolding to change completion function signature

The crypto completion function currently takes a pointer to a
struct crypto_async_request object.  However, in reality the API
does not allow the use of any part of the object apart from the
data field.  For example, ahash/shash will create a fake object
on the stack to pass along a different data field.

This leads to potential bugs where the user may try to dereference
or otherwise use the crypto_async_request object.

This patch adds some temporary scaffolding so that the completion
function can take a void * instead.  Once affected users have been
converted this can be removed.

The helper crypto_request_complete will remain even after the
conversion is complete.  It should be used instead of calling
the completion function directly.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 61b3272..1fd81e7 100644 (file)
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -302,4 +302,11 @@ enum {
        CRYPTO_MSG_ALG_LOADED,
 };
 
+static inline void crypto_request_complete(struct crypto_async_request *req,
+                                          int err)
+{
+       crypto_completion_t complete = req->complete;
+       complete(req, err);
+}
+
 #endif /* _CRYPTO_ALGAPI_H */

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 5d1e961..b18f6e6 100644 (file)
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -176,6 +176,7 @@ struct crypto_async_request;
 struct crypto_tfm;
 struct crypto_type;
 
+typedef struct crypto_async_request crypto_completion_data_t;
 typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);
 
 /**
@@ -595,6 +596,11 @@ struct crypto_wait {
 /*
  * Async ops completion helper functioons
  */
+static inline void *crypto_get_completion_data(crypto_completion_data_t *req)
+{
+       return req->data;
+}
+
 void crypto_req_done(struct crypto_async_request *req, int err);
 
 static inline int crypto_wait_req(int err, struct crypto_wait *wait)