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net: decnet: Fix sleeping inside in af_decnet
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[ Upstream commit 5f119ba ]

The release_sock() is blocking function, it would change the state
after sleeping. use wait_woken() instead.

Fixes: 1da177e ("Linux-2.6.12-rc2")
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@gregkh
Yajun Deng authored and gregkh committed Jul 28, 2021
1 parent d402c60 commit 30b8302
Showing 1 changed file with 12 additions and 15 deletions.
27 changes: 12 additions & 15 deletions net/decnet/af_decnet.c
View file
Expand Up @@ -816,7 +816,7 @@ static int dn_auto_bind(struct socket *sock)
static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
{
struct dn_scp *scp = DN_SK(sk);
DEFINE_WAIT(wait);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
int err;

if (scp->state != DN_CR)
Expand All @@ -826,11 +826,11 @@ static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
scp->segsize_loc = dst_metric_advmss(__sk_dst_get(sk));
dn_send_conn_conf(sk, allocation);

prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
add_wait_queue(sk_sleep(sk), &wait);
for(;;) {
release_sock(sk);
if (scp->state == DN_CC)
*timeo = schedule_timeout(*timeo);
*timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
lock_sock(sk);
err = 0;
if (scp->state == DN_RUN)
Expand All @@ -844,9 +844,8 @@ static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
err = -EAGAIN;
if (!*timeo)
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(sk), &wait);
remove_wait_queue(sk_sleep(sk), &wait);
if (err == 0) {
sk->sk_socket->state = SS_CONNECTED;
} else if (scp->state != DN_CC) {
Expand All @@ -858,7 +857,7 @@ static int dn_confirm_accept(struct sock *sk, long *timeo, gfp_t allocation)
static int dn_wait_run(struct sock *sk, long *timeo)
{
struct dn_scp *scp = DN_SK(sk);
DEFINE_WAIT(wait);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
int err = 0;

if (scp->state == DN_RUN)
Expand All @@ -867,11 +866,11 @@ static int dn_wait_run(struct sock *sk, long *timeo)
if (!*timeo)
return -EALREADY;

prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
add_wait_queue(sk_sleep(sk), &wait);
for(;;) {
release_sock(sk);
if (scp->state == DN_CI || scp->state == DN_CC)
*timeo = schedule_timeout(*timeo);
*timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
lock_sock(sk);
err = 0;
if (scp->state == DN_RUN)
Expand All @@ -885,9 +884,8 @@ static int dn_wait_run(struct sock *sk, long *timeo)
err = -ETIMEDOUT;
if (!*timeo)
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(sk), &wait);
remove_wait_queue(sk_sleep(sk), &wait);
out:
if (err == 0) {
sk->sk_socket->state = SS_CONNECTED;
Expand Down Expand Up @@ -1032,16 +1030,16 @@ static void dn_user_copy(struct sk_buff *skb, struct optdata_dn *opt)

static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
{
DEFINE_WAIT(wait);
DEFINE_WAIT_FUNC(wait, woken_wake_function);
struct sk_buff *skb = NULL;
int err = 0;

prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
add_wait_queue(sk_sleep(sk), &wait);
for(;;) {
release_sock(sk);
skb = skb_dequeue(&sk->sk_receive_queue);
if (skb == NULL) {
*timeo = schedule_timeout(*timeo);
*timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, *timeo);
skb = skb_dequeue(&sk->sk_receive_queue);
}
lock_sock(sk);
Expand All @@ -1056,9 +1054,8 @@ static struct sk_buff *dn_wait_for_connect(struct sock *sk, long *timeo)
err = -EAGAIN;
if (!*timeo)
break;
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk_sleep(sk), &wait);
remove_wait_queue(sk_sleep(sk), &wait);

return skb == NULL ? ERR_PTR(err) : skb;
}
Expand Down

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