tls: Fix zerocopy_from_iter iov handling
zerocopy_from_iter iterates over the message, but it doesn't revert the
updates made by the iov iteration. This patch fixes it. Now, the iov can
be used after calling zerocopy_from_iter.
Fixes: 3c4d75591 ("tls: kernel TLS support")
Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index fe5735c..7d194c0 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -263,7 +263,7 @@ static int zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
int length, int *pages_used,
unsigned int *size_used,
struct scatterlist *to, int to_max_pages,
- bool charge)
+ bool charge, bool revert)
{
struct page *pages[MAX_SKB_FRAGS];
@@ -314,6 +314,8 @@ static int zerocopy_from_iter(struct sock *sk, struct iov_iter *from,
out:
*size_used = size;
*pages_used = num_elem;
+ if (revert)
+ iov_iter_revert(from, size);
return rc;
}
@@ -415,7 +417,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
&ctx->sg_plaintext_size,
ctx->sg_plaintext_data,
ARRAY_SIZE(ctx->sg_plaintext_data),
- true);
+ true, false);
if (ret)
goto fallback_to_reg_send;
@@ -825,7 +827,7 @@ int tls_sw_recvmsg(struct sock *sk,
err = zerocopy_from_iter(sk, &msg->msg_iter,
to_copy, &pages,
&chunk, &sgin[1],
- MAX_SKB_FRAGS, false);
+ MAX_SKB_FRAGS, false, true);
if (err < 0)
goto fallback_to_reg_recv;