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SubjectRe: [PATCH v5 RESEND] sctp: fix refcount bug in sctp_wfree
On Fri, Mar 27, 2020 at 09:28:32AM +0800, Qiujun Huang wrote:
> We should iterate over the datamsgs to modify

Just two small things now.
s/modify/move/ , it's more accurate.
But mainly because...

...
>
> Reported-and-tested-by:syzbot+cea71eec5d6de256d54d@syzkaller.appspotmail.com

checkpatch.pl is warning that there should be an empty space after the
':' here.

Otherwise, looks very good.

Btw, I learned a lot about syzbot new features with your tests, thanks :-)

> Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
> ---
> net/sctp/socket.c | 31 +++++++++++++++++++++++--------
> 1 file changed, 23 insertions(+), 8 deletions(-)
>
> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
> index 1b56fc440606..f68076713162 100644
> --- a/net/sctp/socket.c
> +++ b/net/sctp/socket.c
> @@ -147,29 +147,44 @@ static void sctp_clear_owner_w(struct sctp_chunk *chunk)
> skb_orphan(chunk->skb);
> }
>
> +#define traverse_and_process() \
> +do { \
> + msg = chunk->msg; \
> + if (msg == prev_msg) \
> + continue; \
> + list_for_each_entry(c, &msg->chunks, frag_list) { \
> + if ((clear && asoc->base.sk == c->skb->sk) || \
> + (!clear && asoc->base.sk != c->skb->sk)) \
> + cb(c); \
> + } \
> + prev_msg = msg; \
> +} while (0)
> +
> static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
> + bool clear,
> void (*cb)(struct sctp_chunk *))
>
> {
> + struct sctp_datamsg *msg, *prev_msg = NULL;
> struct sctp_outq *q = &asoc->outqueue;
> + struct sctp_chunk *chunk, *c;
> struct sctp_transport *t;
> - struct sctp_chunk *chunk;
>
> list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
> list_for_each_entry(chunk, &t->transmitted, transmitted_list)
> - cb(chunk);
> + traverse_and_process();
>
> list_for_each_entry(chunk, &q->retransmit, transmitted_list)
> - cb(chunk);
> + traverse_and_process();
>
> list_for_each_entry(chunk, &q->sacked, transmitted_list)
> - cb(chunk);
> + traverse_and_process();
>
> list_for_each_entry(chunk, &q->abandoned, transmitted_list)
> - cb(chunk);
> + traverse_and_process();
>
> list_for_each_entry(chunk, &q->out_chunk_list, list)
> - cb(chunk);
> + traverse_and_process();
> }
>
> static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
> @@ -9574,9 +9589,9 @@ static int sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
> * paths won't try to lock it and then oldsk.
> */
> lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
> - sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
> + sctp_for_each_tx_datachunk(assoc, true, sctp_clear_owner_w);
> sctp_assoc_migrate(assoc, newsk);
> - sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
> + sctp_for_each_tx_datachunk(assoc, false, sctp_set_owner_w);
>
> /* If the association on the newsk is already closed before accept()
> * is called, set RCV_SHUTDOWN flag.
> --
> 2.17.1
>

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