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net/tls: use sg_next() to walk sg entries 

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>
This commit is contained in:
Jakub Kicinski 2019-11-27 12:16:44 -08:00 committed by David S. Miller
parent 9e5ffed37d
commit c5daa6cccd
3 changed files with 5 additions and 13 deletions
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2
include/net/tls.h
View File

@ -376,7 +376,7 @@ int tls_push_sg(struct sock *sk, struct tls_context *ctx,
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)
{

13
net/tls/tls_main.c
View File

@ -209,24 +209,15 @@ int tls_push_partial_record(struct sock *sk, struct tls_context *ctx,
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)

3
net/tls/tls_sw.c
View File

@ -2089,7 +2089,8 @@ void tls_sw_release_resources_tx(struct sock *sk)
/* 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);