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 fe5735c57774bbe6ebbc7f88344637d5e1079137..7d194c0cd6cf11d50783d8bd268e543002ed02d7 100644 (file)
--- 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 @@ alloc_encrypted:
                                &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;