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crypto: fix af_alg_make_sg() conversion to iov_iter 

Commit 1d10eb2f15 ("crypto: switch af_alg_make_sg() to iov_iter")
broke af_alg_make_sg() and skcipher_recvmsg() in the process of moving
them to the iov_iter interfaces.  The 'npages' calculation in the formar
calculated the number of *bytes* in the pages, and in the latter case
the conversion didn't re-read the value of 'ctx->used' after waiting for
it to become non-zero.

This reverts to the original code for both these cases.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2015-02-10 19:55:45 -08:00
parent b0f9ca53cb
commit 9399f0c514
2 changed files with 3 additions and 4 deletions
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2
crypto/af_alg.c
View File

@ -348,7 +348,7 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
if (n < 0)
return n;
npages = PAGE_ALIGN(off + n);
npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (WARN_ON(npages == 0))
return -EINVAL;

5
crypto/algif_skcipher.c
View File

@ -439,14 +439,13 @@ static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock,
while (!sg->length)
sg++;
used = ctx->used;
if (!used) {
if (!ctx->used) {
err = skcipher_wait_for_data(sk, flags);
if (err)
goto unlock;
}
used = min_t(unsigned long, used, iov_iter_count(&msg->msg_iter));
used = min_t(unsigned long, ctx->used, iov_iter_count(&msg->msg_iter));
used = af_alg_make_sg(&ctx->rsgl, &msg->msg_iter, used);
err = used;