* [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE
@ 2013-09-07 14:44 Daniel Borkmann
2013-09-08 12:07 ` Neil Horman
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Daniel Borkmann @ 2013-09-07 14:44 UTC (permalink / raw)
To: davem; +Cc: netdev, linux-sctp, Jacob Keller
If we do not add braces around ...
mask |= POLLERR |
sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
... then this condition always evaluates to true as POLLERR is
defined as 8 and binary or'd with whatever result comes out of
sock_flag(). Hence instead of (X | Y) ? A : B, transform it into
X | (Y ? A : B). Unfortunatelty, commit 8facd5fb73 ("net: fix
smatch warnings inside datagram_poll") forgot about SCTP. :-(
Introduced by 7d4c04fc170 ("net: add option to enable error queue
packets waking select").
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Jacob Keller <jacob.e.keller@intel.com>
---
net/sctp/socket.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index d5d5882..5462bbb 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -6176,7 +6176,7 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
/* Is there any exceptional events? */
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
mask |= POLLERR |
- sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
+ (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
if (sk->sk_shutdown & RCV_SHUTDOWN)
mask |= POLLRDHUP | POLLIN | POLLRDNORM;
if (sk->sk_shutdown == SHUTDOWN_MASK)
--
1.7.11.7
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE
2013-09-07 14:44 [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE Daniel Borkmann
@ 2013-09-08 12:07 ` Neil Horman
2013-09-09 13:56 ` Vlad Yasevich
2013-09-11 20:14 ` David Miller
2 siblings, 0 replies; 5+ messages in thread
From: Neil Horman @ 2013-09-08 12:07 UTC (permalink / raw)
To: Daniel Borkmann; +Cc: davem, netdev, linux-sctp, Jacob Keller
On Sat, Sep 07, 2013 at 04:44:59PM +0200, Daniel Borkmann wrote:
> If we do not add braces around ...
>
> mask |= POLLERR |
> sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
>
> ... then this condition always evaluates to true as POLLERR is
> defined as 8 and binary or'd with whatever result comes out of
> sock_flag(). Hence instead of (X | Y) ? A : B, transform it into
> X | (Y ? A : B). Unfortunatelty, commit 8facd5fb73 ("net: fix
> smatch warnings inside datagram_poll") forgot about SCTP. :-(
>
> Introduced by 7d4c04fc170 ("net: add option to enable error queue
> packets waking select").
>
> Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
> Cc: Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
> ---
> net/sctp/socket.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index d5d5882..5462bbb 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -6176,7 +6176,7 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
> /* Is there any exceptional events? */
> if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
> mask |= POLLERR |
> - sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
> + (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
> if (sk->sk_shutdown & RCV_SHUTDOWN)
> mask |= POLLRDHUP | POLLIN | POLLRDNORM;
> if (sk->sk_shutdown == SHUTDOWN_MASK)
> --
> 1.7.11.7
>
> --
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>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE
2013-09-07 14:44 [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE Daniel Borkmann
2013-09-08 12:07 ` Neil Horman
@ 2013-09-09 13:56 ` Vlad Yasevich
2013-09-09 19:12 ` Keller, Jacob E
2013-09-11 20:14 ` David Miller
2 siblings, 1 reply; 5+ messages in thread
From: Vlad Yasevich @ 2013-09-09 13:56 UTC (permalink / raw)
To: Daniel Borkmann; +Cc: davem, netdev, linux-sctp, Jacob Keller
On 09/07/2013 10:44 AM, Daniel Borkmann wrote:
> If we do not add braces around ...
>
> mask |= POLLERR |
> sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
>
> ... then this condition always evaluates to true as POLLERR is
> defined as 8 and binary or'd with whatever result comes out of
> sock_flag(). Hence instead of (X | Y) ? A : B, transform it into
> X | (Y ? A : B). Unfortunatelty, commit 8facd5fb73 ("net: fix
> smatch warnings inside datagram_poll") forgot about SCTP. :-(
>
> Introduced by 7d4c04fc170 ("net: add option to enable error queue
> packets waking select").
>
> Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
> Cc Jacob Keller <jacob.e.keller@intel.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
-vlad
> ---
> net/sctp/socket.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index d5d5882..5462bbb 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -6176,7 +6176,7 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
> /* Is there any exceptional events? */
> if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
> mask |= POLLERR |
> - sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
> + (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
> if (sk->sk_shutdown & RCV_SHUTDOWN)
> mask |= POLLRDHUP | POLLIN | POLLRDNORM;
> if (sk->sk_shutdown == SHUTDOWN_MASK)
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE
2013-09-09 13:56 ` Vlad Yasevich
@ 2013-09-09 19:12 ` Keller, Jacob E
0 siblings, 0 replies; 5+ messages in thread
From: Keller, Jacob E @ 2013-09-09 19:12 UTC (permalink / raw)
To: Vlad Yasevich
Cc: Daniel Borkmann, davem@davemloft.net, netdev@vger.kernel.org,
linux-sctp@vger.kernel.org
On Mon, 2013-09-09 at 09:56 -0400, Vlad Yasevich wrote:
> On 09/07/2013 10:44 AM, Daniel Borkmann wrote:
> > If we do not add braces around ...
> >
> > mask |= POLLERR |
> > sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
> >
> > ... then this condition always evaluates to true as POLLERR is
> > defined as 8 and binary or'd with whatever result comes out of
> > sock_flag(). Hence instead of (X | Y) ? A : B, transform it into
> > X | (Y ? A : B). Unfortunatelty, commit 8facd5fb73 ("net: fix
> > smatch warnings inside datagram_poll") forgot about SCTP. :-(
> >
> > Introduced by 7d4c04fc170 ("net: add option to enable error queue
> > packets waking select").
> >
> > Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
> > Cc Jacob Keller <jacob.e.keller@intel.com>
>
> Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Jacob Keller <jacob.e.keller@intel.com>
> -vlad
>
> > ---
> > net/sctp/socket.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> > index d5d5882..5462bbb 100644
> > --- a/net/sctp/socket.c
> > +++ b/net/sctp/socket.c
> > @@ -6176,7 +6176,7 @@ unsigned int sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
> > /* Is there any exceptional events? */
> > if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
> > mask |= POLLERR |
> > - sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
> > + (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
> > if (sk->sk_shutdown & RCV_SHUTDOWN)
> > mask |= POLLRDHUP | POLLIN | POLLRDNORM;
> > if (sk->sk_shutdown == SHUTDOWN_MASK)
> >
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE
2013-09-07 14:44 [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE Daniel Borkmann
2013-09-08 12:07 ` Neil Horman
2013-09-09 13:56 ` Vlad Yasevich
@ 2013-09-11 20:14 ` David Miller
2 siblings, 0 replies; 5+ messages in thread
From: David Miller @ 2013-09-11 20:14 UTC (permalink / raw)
To: dborkman; +Cc: netdev, linux-sctp, jacob.e.keller
From: Daniel Borkmann <dborkman@redhat.com>
Date: Sat, 7 Sep 2013 16:44:59 +0200
> If we do not add braces around ...
>
> mask |= POLLERR |
> sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0;
>
> ... then this condition always evaluates to true as POLLERR is
> defined as 8 and binary or'd with whatever result comes out of
> sock_flag(). Hence instead of (X | Y) ? A : B, transform it into
> X | (Y ? A : B). Unfortunatelty, commit 8facd5fb73 ("net: fix
> smatch warnings inside datagram_poll") forgot about SCTP. :-(
>
> Introduced by 7d4c04fc170 ("net: add option to enable error queue
> packets waking select").
>
> Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Applied and queued up for -stable.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-09-07 14:44 [PATCH net] net: sctp: fix bug in sctp_poll for SOCK_SELECT_ERR_QUEUE Daniel Borkmann
2013-09-08 12:07 ` Neil Horman
2013-09-09 13:56 ` Vlad Yasevich
2013-09-09 19:12 ` Keller, Jacob E
2013-09-11 20:14 ` David Miller
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