crypto: switch af_alg_make_sg() to iov_iter
With that, all ->sendmsg() instances are converted to iov_iter primitives
and are agnostic wrt the kind of iov_iter they are working with.
So's the last remaining ->recvmsg() instance that wasn't kind-agnostic yet.
All ->sendmsg() and ->recvmsg() advance ->msg_iter by the amount actually
copied and none of them modifies the underlying iovec, etc.
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 01f56eb..01da360 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -41,8 +41,6 @@
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
- unsigned long iovlen;
- const struct iovec *iov;
long copied = 0;
int err;
@@ -58,37 +56,28 @@
ctx->more = 0;
- for (iov = msg->msg_iter.iov, iovlen = msg->msg_iter.nr_segs; iovlen > 0;
- iovlen--, iov++) {
- unsigned long seglen = iov->iov_len;
- char __user *from = iov->iov_base;
+ while (iov_iter_count(&msg->msg_iter)) {
+ int len = iov_iter_count(&msg->msg_iter);
- while (seglen) {
- int len = min_t(unsigned long, seglen, limit);
- int newlen;
+ if (len > limit)
+ len = limit;
- newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
- if (newlen < 0) {
- err = copied ? 0 : newlen;
- goto unlock;
- }
-
- ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
- newlen);
-
- err = af_alg_wait_for_completion(
- crypto_ahash_update(&ctx->req),
- &ctx->completion);
-
- af_alg_free_sg(&ctx->sgl);
-
- if (err)
- goto unlock;
-
- seglen -= newlen;
- from += newlen;
- copied += newlen;
+ len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
+ if (len < 0) {
+ err = copied ? 0 : len;
+ goto unlock;
}
+
+ ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
+
+ err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
+ &ctx->completion);
+ af_alg_free_sg(&ctx->sgl);
+ if (err)
+ goto unlock;
+
+ copied += len;
+ iov_iter_advance(&msg->msg_iter, len);
}
err = 0;