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1. In closed state: in sctp_sf_do_5_1D_ce():
When asoc is NULL, making packet for abort will use chunk's vtag
in sctp_ootb_pkt_new(). But when asoc exists, vtag from the chunk
should be verified before using peer.i.init_tag to make packet
for abort in sctp_ootb_pkt_new(), and just discard it if vtag is
not correct.
2. In the other states: in sctp_sf_do_5_2_4_dupcook():
asoc always exists, but duplicate cookie_echo's vtag will be
handled by sctp_tietags_compare() and then take actions, so before
that we only verify the vtag for the abort sent for invalid chunk
length.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
a64b341b86