From: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
Date: Tue, 7 Feb 2017 17:03:21 -0200
> There is no reason to use list_del_init() in these places as we are
> going to free/destroy the memory in a few lines below.
>
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@xxxxxxxxx>
> ---
> net/sctp/associola.c | 14 ++++----------
> net/sctp/auth.c | 8 ++------
> net/sctp/chunk.c | 4 ++--
> net/sctp/outqueue.c | 14 +++++++-------
> net/sctp/sm_make_chunk.c | 3 +--
> 5 files changed, 16 insertions(+), 27 deletions(-)
>
> diff --git a/net/sctp/associola.c b/net/sctp/associola.c
> index e50dc6d7543fd6acfa7442f3a9ee575203c7718d..7eb9dacfa53a438b20a34319cf01c6c9a591f0c3 100644
> --- a/net/sctp/associola.c
> +++ b/net/sctp/associola.c
> @@ -1638,25 +1638,19 @@ int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp)
> static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc)
> {
> struct sctp_chunk *asconf;
> - struct sctp_chunk *tmp;
>
> - list_for_each_entry_safe(asconf, tmp, &asoc->addip_chunk_list, list) {
> - list_del_init(&asconf->list);
> + list_for_each_entry(asconf, &asoc->addip_chunk_list, list)
> sctp_chunk_free(asconf);
> - }
> }
This leave freed memory on the asoc->addip_chunk_list, in fact why aren't you seeing
the BUG_ON() in sctp_chunk_destroy() get triggered? If you elide the list_del() here
then the "list_empty(&chunk->list)" check there will not be true.
I don't think this transformation here is legal at all.
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