[net] sctp: fix error handling on stream scheduler initialization

It allocates the extended area for outbound streams only on sendmsg
calls, if they are not yet allocated.  When using the priority
stream scheduler, this initialization may imply into a subsequent
allocation, which may fail.  In this case, it was aborting the stream
scheduler initialization but leaving the ->ext pointer (allocated) in
there, thus in a partially initialized state.  On a subsequent call to
sendmsg, it would notice the ->ext pointer in there, and trip on
uninitialized stuff when trying to schedule the data chunk.

The fix is undo the ->ext initialization if the stream scheduler
initialization fails and avoid the partially initialized state.

Although syzkaller bisected this to commit 4ff40b86262b ("sctp: set
chunk transport correctly when it's a new asoc"), this bug was actually
introduced on the commit I marked below.

Reported-by: syzbot+c1a380d42b190ad1e559@syzkaller.appspotmail.com
Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
---
 net/sctp/stream.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

On Thu, Jun 27, 2019 at 07:48:10PM -0300, Marcelo Ricardo Leitner wrote:
> It allocates the extended area for outbound streams only on sendmsg
> calls, if they are not yet allocated.  When using the priority
> stream scheduler, this initialization may imply into a subsequent
> allocation, which may fail.  In this case, it was aborting the stream
> scheduler initialization but leaving the ->ext pointer (allocated) in
> there, thus in a partially initialized state.  On a subsequent call to
> sendmsg, it would notice the ->ext pointer in there, and trip on
> uninitialized stuff when trying to schedule the data chunk.
> 
> The fix is undo the ->ext initialization if the stream scheduler
> initialization fails and avoid the partially initialized state.
> 
> Although syzkaller bisected this to commit 4ff40b86262b ("sctp: set
> chunk transport correctly when it's a new asoc"), this bug was actually
> introduced on the commit I marked below.
> 
> Reported-by: syzbot+c1a380d42b190ad1e559@syzkaller.appspotmail.com
> Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
> Tested-by: Xin Long <lucien.xin@gmail.com>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
> ---
>  net/sctp/stream.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> index 93ed07877337eace4ef7f4775dda5868359ada37..25946604af85c09917e63e5c4a8d7d6fa2caebc4 100644
> --- a/net/sctp/stream.c
> +++ b/net/sctp/stream.c
> @@ -153,13 +153,20 @@ int sctp_stream_init(struct sctp_stream *stream, __u16 outcnt, __u16 incnt,
>  int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid)
>  {
>  	struct sctp_stream_out_ext *soute;
> +	int ret;
>  
>  	soute = kzalloc(sizeof(*soute), GFP_KERNEL);
>  	if (!soute)
>  		return -ENOMEM;
>  	SCTP_SO(stream, sid)->ext = soute;
>  
> -	return sctp_sched_init_sid(stream, sid, GFP_KERNEL);
> +	ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL);
> +	if (ret) {
> +		kfree(SCTP_SO(stream, sid)->ext);
> +		SCTP_SO(stream, sid)->ext = NULL;
> +	}
> +
> +	return ret;
>  }
>  
>  void sctp_stream_free(struct sctp_stream *stream)
> -- 
> 2.21.0
> 
> 
Acked-by: Neil Horman <nhorman@redhat.com>

From: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Date: Thu, 27 Jun 2019 19:48:10 -0300

> It allocates the extended area for outbound streams only on sendmsg
> calls, if they are not yet allocated.  When using the priority
> stream scheduler, this initialization may imply into a subsequent
> allocation, which may fail.  In this case, it was aborting the stream
> scheduler initialization but leaving the ->ext pointer (allocated) in
> there, thus in a partially initialized state.  On a subsequent call to
> sendmsg, it would notice the ->ext pointer in there, and trip on
> uninitialized stuff when trying to schedule the data chunk.
> 
> The fix is undo the ->ext initialization if the stream scheduler
> initialization fails and avoid the partially initialized state.
> 
> Although syzkaller bisected this to commit 4ff40b86262b ("sctp: set
> chunk transport correctly when it's a new asoc"), this bug was actually
> introduced on the commit I marked below.
> 
> Reported-by: syzbot+c1a380d42b190ad1e559@syzkaller.appspotmail.com
> Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
> Tested-by: Xin Long <lucien.xin@gmail.com>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>

Applied and queued up for -stable, thanks.