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| author | Guillaume Nault <gnault@redhat.com> | 2020-10-02 21:53:08 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-10-04 15:09:26 -0700 |
| commit | 4296adc3e32f5d544a95061160fe7e127be1b9ff (patch) | |
| tree | 2f43479d747def5e6782893e35dbf998b6e2a4ea /net/rxrpc/key.c | |
| parent | f4544e5361da5050ff5c0330ceea095cb5dbdd72 (diff) | |
| download | lwn-4296adc3e32f5d544a95061160fe7e127be1b9ff.tar.gz lwn-4296adc3e32f5d544a95061160fe7e127be1b9ff.zip | |
net/core: check length before updating Ethertype in skb_mpls_{push,pop}
Openvswitch allows to drop a packet's Ethernet header, therefore
skb_mpls_push() and skb_mpls_pop() might be called with ethernet=true
and mac_len=0. In that case the pointer passed to skb_mod_eth_type()
doesn't point to an Ethernet header and the new Ethertype is written at
unexpected locations.
Fix this by verifying that mac_len is big enough to contain an Ethernet
header.
Fixes: fa4e0f8855fc ("net/sched: fix corrupted L2 header with MPLS 'push' and 'pop' actions")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Acked-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rxrpc/key.c')
0 files changed, 0 insertions, 0 deletions