net/tls: use sg_next() to walk sg entries
[ Upstream commit c5daa6cccdc2f94aca2c9b3fa5f94e4469997293 ]
Partially sent record cleanup path increments an SG entry
directly instead of using sg_next(). This should not be a
problem today, as encrypted messages should be always
allocated as arrays. But given this is a cleanup path it's
easy to miss was this ever to change. Use sg_next(), and
simplify the code.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/include/net/tls.h b/include/net/tls.h
index b3d57c4..093abb5a 100644
--- a/include/net/tls.h
+++ b/include/net/tls.h
@@ -395,7 +395,7 @@
int flags);
int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
int flags);
-bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
+void tls_free_partial_record(struct sock *sk, struct tls_context *ctx);
static inline struct tls_msg *tls_msg(struct sk_buff *skb)
{
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index f874cc0..eff4442 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -209,24 +209,15 @@
return tls_push_sg(sk, ctx, sg, offset, flags);
}
-bool tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
+void tls_free_partial_record(struct sock *sk, struct tls_context *ctx)
{
struct scatterlist *sg;
- sg = ctx->partially_sent_record;
- if (!sg)
- return false;
-
- while (1) {
+ for (sg = ctx->partially_sent_record; sg; sg = sg_next(sg)) {
put_page(sg_page(sg));
sk_mem_uncharge(sk, sg->length);
-
- if (sg_is_last(sg))
- break;
- sg++;
}
ctx->partially_sent_record = NULL;
- return true;
}
static void tls_write_space(struct sock *sk)
diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index 8343f30..5dd0f01 100644
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -2084,7 +2084,8 @@
/* Free up un-sent records in tx_list. First, free
* the partially sent record if any at head of tx_list.
*/
- if (tls_free_partial_record(sk, tls_ctx)) {
+ if (tls_ctx->partially_sent_record) {
+ tls_free_partial_record(sk, tls_ctx);
rec = list_first_entry(&ctx->tx_list,
struct tls_rec, list);
list_del(&rec->list);