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dc5a6f4)
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cea0cc80a6777beb6eb643d4ad53690e1ad1d4ff upstream.
Commit
dfcb9f4f99f1 ("sctp: deny peeloff operation on asocs with threads
sleeping on it") fixed the race between peeloff and wait sndbuf by
checking waitqueue_active(&asoc->wait) in sctp_do_peeloff().
But it actually doesn't work, as even if waitqueue_active returns false
the waiting sndbuf thread may still not yet hold sk lock. After asoc is
peeled off, sk is not asoc->base.sk any more, then to hold the old sk
lock couldn't make assoc safe to access.
This patch is to fix this by changing to hold the new sk lock if sk is
not asoc->base.sk, meanwhile, also set the sk in sctp_sendmsg with the
new sk.
With this fix, there is no more race between peeloff and waitbuf, the
check 'waitqueue_active' in sctp_do_peeloff can be removed.
Thanks Marcelo and Neil for making this clear.
v1->v2:
fix it by changing to lock the new sock instead of adding a flag in asoc.
Suggested-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
/* Forward declarations for internal helper functions. */
static int sctp_writeable(struct sock *sk);
static void sctp_wfree(struct sk_buff *skb);
/* Forward declarations for internal helper functions. */
static int sctp_writeable(struct sock *sk);
static void sctp_wfree(struct sk_buff *skb);
-static int sctp_wait_for_sndbuf(struct sctp_association *, long *timeo_p,
- size_t msg_len);
+static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
+ size_t msg_len, struct sock **orig_sk);
static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
static int sctp_wait_for_accept(struct sock *sk, long timeo);
static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
static int sctp_wait_for_accept(struct sock *sk, long timeo);
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
if (!sctp_wspace(asoc)) {
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
if (!sctp_wspace(asoc)) {
- err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
+ /* sk can be changed by peel off when waiting for buf. */
+ err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len, &sk);
if (err)
goto out_free;
}
if (err)
goto out_free;
}
if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
return -EINVAL;
if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
return -EINVAL;
- /* If there is a thread waiting on more sndbuf space for
- * sending on this asoc, it cannot be peeled.
- */
- if (waitqueue_active(&asoc->wait))
- return -EBUSY;
-
/* An association cannot be branched off from an already peeled-off
* socket, nor is this supported for tcp style sockets.
*/
/* An association cannot be branched off from an already peeled-off
* socket, nor is this supported for tcp style sockets.
*/
/* Helper function to wait for space in the sndbuf. */
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
/* Helper function to wait for space in the sndbuf. */
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
+ size_t msg_len, struct sock **orig_sk)
{
struct sock *sk = asoc->base.sk;
int err = 0;
{
struct sock *sk = asoc->base.sk;
int err = 0;
sctp_release_sock(sk);
current_timeo = schedule_timeout(current_timeo);
sctp_lock_sock(sk);
sctp_release_sock(sk);
current_timeo = schedule_timeout(current_timeo);
sctp_lock_sock(sk);
+ if (sk != asoc->base.sk) {
+ release_sock(sk);
+ sk = asoc->base.sk;
+ lock_sock(sk);
+ }
*timeo_p = current_timeo;
}
out:
*timeo_p = current_timeo;
}
out:
finish_wait(&asoc->wait, &wait);
/* Release the association's refcnt. */
finish_wait(&asoc->wait, &wait);
/* Release the association's refcnt. */