From 2da19ed3e4a87db16c0f69039da9f17a9596c350 Mon Sep 17 00:00:00 2001 From: Doron Roberts-Kedes Date: Thu, 26 Jul 2018 07:59:36 -0700 Subject: tls: Fix improper revert in zerocopy_from_iter The current code is problematic because the iov_iter is reverted and never advanced in the non-error case. This patch skips the revert in the non-error case. This patch also fixes the amount by which the iov_iter is reverted. Currently, iov_iter is reverted by size, which can be greater than the amount by which the iter was actually advanced. Instead, only revert by the amount that the iter was advanced. Fixes: 4718799817c5 ("tls: Fix zerocopy_from_iter iov handling") Signed-off-by: Doron Roberts-Kedes Signed-off-by: David S. Miller --- net/tls/tls_sw.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) (limited to 'net/tls') diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c index e80d70a1e138..6deceb7c56ba 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 revert) + bool charge) { struct page *pages[MAX_SKB_FRAGS]; @@ -312,10 +312,10 @@ static int zerocopy_from_iter(struct sock *sk, struct iov_iter *from, } out: + if (rc) + iov_iter_revert(from, size - *size_used); *size_used = size; *pages_used = num_elem; - if (revert) - iov_iter_revert(from, size); return rc; } @@ -417,7 +417,7 @@ alloc_encrypted: &ctx->sg_plaintext_size, ctx->sg_plaintext_data, ARRAY_SIZE(ctx->sg_plaintext_data), - true, false); + true); if (ret) goto fallback_to_reg_send; @@ -428,8 +428,6 @@ alloc_encrypted: continue; fallback_to_reg_send: - iov_iter_revert(&msg->msg_iter, - ctx->sg_plaintext_size - orig_size); trim_sg(sk, ctx->sg_plaintext_data, &ctx->sg_plaintext_num_elem, &ctx->sg_plaintext_size, @@ -834,7 +832,7 @@ 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, true); + MAX_SKB_FRAGS, false); if (err < 0) goto fallback_to_reg_recv; -- cgit v1.2.3