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author | Jason Baron <jbaron@akamai.com> | 2020-02-17 15:38:09 -0500 |
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committer | David S. Miller <davem@davemloft.net> | 2020-02-17 21:33:28 -0800 |
commit | 8a9093c79863b58cc2f9874d7ae788f0d622a596 (patch) | |
tree | f86256403d55b8cd2474e808e4ba0feb404aa012 /net/sctp | |
parent | a81541041ceb55bcec9a8bb8ad3482263f0a205a (diff) | |
download | linux-stable-8a9093c79863b58cc2f9874d7ae788f0d622a596.tar.gz linux-stable-8a9093c79863b58cc2f9874d7ae788f0d622a596.tar.bz2 linux-stable-8a9093c79863b58cc2f9874d7ae788f0d622a596.zip |
net: sched: correct flower port blocking
tc flower rules that are based on src or dst port blocking are sometimes
ineffective due to uninitialized stack data. __skb_flow_dissect() extracts
ports from the skb for tc flower to match against. However, the port
dissection is not done when when the FLOW_DIS_IS_FRAGMENT bit is set in
key_control->flags. All callers of __skb_flow_dissect(), zero-out the
key_control field except for fl_classify() as used by the flower
classifier. Thus, the FLOW_DIS_IS_FRAGMENT may be set on entry to
__skb_flow_dissect(), since key_control is allocated on the stack
and may not be initialized.
Since key_basic and key_control are present for all flow keys, let's
make sure they are initialized.
Fixes: 62230715fd24 ("flow_dissector: do not dissect l4 ports for fragments")
Co-developed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Jason Baron <jbaron@akamai.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
0 files changed, 0 insertions, 0 deletions