4.20-stable review patch. If anyone has any objections, please let me know.
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From: Xin Long lucien.xin@gmail.com
[ Upstream commit 4ff40b86262b73553ee47cc3784ce8ba0f220bd8 ]
In the paths:
sctp_sf_do_unexpected_init() -> sctp_make_init_ack() sctp_sf_do_dupcook_a/b()() -> sctp_sf_do_5_1D_ce()
The new chunk 'retval' transport is set from the incoming chunk 'chunk' transport. However, 'retval' transport belong to the new asoc, which is a different one from 'chunk' transport's asoc.
It will cause that the 'retval' chunk gets set with a wrong transport. Later when sending it and because of Commit b9fd683982c9 ("sctp: add sctp_packet_singleton"), sctp_packet_singleton() will set some fields, like vtag to 'retval' chunk from that wrong transport's asoc.
This patch is to fix it by setting 'retval' transport correctly which belongs to the right asoc in sctp_make_init_ack() and sctp_sf_do_5_1D_ce().
Fixes: b9fd683982c9 ("sctp: add sctp_packet_singleton") Reported-by: Ying Xu yinxu@redhat.com Signed-off-by: Xin Long lucien.xin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/sctp/sm_make_chunk.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
--- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -495,7 +495,10 @@ struct sctp_chunk *sctp_make_init_ack(co * * [INIT ACK back to where the INIT came from.] */ - retval->transport = chunk->transport; + if (chunk->transport) + retval->transport = + sctp_assoc_lookup_paddr(asoc, + &chunk->transport->ipaddr);
retval->subh.init_hdr = sctp_addto_chunk(retval, sizeof(initack), &initack); @@ -642,8 +645,10 @@ struct sctp_chunk *sctp_make_cookie_ack( * * [COOKIE ACK back to where the COOKIE ECHO came from.] */ - if (retval && chunk) - retval->transport = chunk->transport; + if (retval && chunk && chunk->transport) + retval->transport = + sctp_assoc_lookup_paddr(asoc, + &chunk->transport->ipaddr);
return retval; }