crypto: fix af_alg_make_sg() conversion to iov_iter
Commit 1d10eb2f156f ("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>
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index eb78fe8..3e80d8b 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -348,7 +348,7 @@
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;