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authorAl Viro <viro@zeniv.linux.org.uk>2014-11-28 16:39:25 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-02-04 01:34:15 -0500
commit1d10eb2f156f5fc83cf6c7ce60441592e66eadb3 (patch)
treeb330398099f3da04395326250a747399495dc906 /crypto/af_alg.c
parent31a25fae85956e3a9c778141d29e5e803fb0b124 (diff)
downloadlinux-sh-1d10eb2f156f5fc83cf6c7ce60441592e66eadb3.tar.gz
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>
Diffstat (limited to 'crypto/af_alg.c')
-rw-r--r--crypto/af_alg.c40
1 files changed, 11 insertions, 29 deletions
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 4665b79c729a..eb78fe8a60c8 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -338,49 +338,31 @@ static const struct net_proto_family alg_family = {
.owner = THIS_MODULE,
};
-int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
- int write)
+int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
{
- unsigned long from = (unsigned long)addr;
- unsigned long npages;
- unsigned off;
- int err;
- int i;
-
- err = -EFAULT;
- if (!access_ok(write ? VERIFY_READ : VERIFY_WRITE, addr, len))
- goto out;
-
- off = from & ~PAGE_MASK;
- npages = (off + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
- if (npages > ALG_MAX_PAGES)
- npages = ALG_MAX_PAGES;
+ size_t off;
+ ssize_t n;
+ int npages, i;
- err = get_user_pages_fast(from, npages, write, sgl->pages);
- if (err < 0)
- goto out;
+ n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
+ if (n < 0)
+ return n;
- npages = err;
- err = -EINVAL;
+ npages = PAGE_ALIGN(off + n);
if (WARN_ON(npages == 0))
- goto out;
-
- err = 0;
+ return -EINVAL;
sg_init_table(sgl->sg, npages);
- for (i = 0; i < npages; i++) {
+ for (i = 0, len = n; i < npages; i++) {
int plen = min_t(int, len, PAGE_SIZE - off);
sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
off = 0;
len -= plen;
- err += plen;
}
-
-out:
- return err;
+ return n;
}
EXPORT_SYMBOL_GPL(af_alg_make_sg);