af_iucv: fix race in __iucv_sock_wait()
Moving prepare_to_wait before the condition to avoid a race between
schedule_timeout and wake up.
The race can appear during iucv_sock_connect() and iucv_callback_connack().
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 3c915fb..21ee68b 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -59,8 +59,8 @@
DEFINE_WAIT(__wait); \
long __timeo = timeo; \
ret = 0; \
+ prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \
while (!(condition)) { \
- prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \
if (!__timeo) { \
ret = -EAGAIN; \
break; \