diff options
| author | Stephen Hemminger <stephen@networkplumber.org> | 2018-04-27 11:16:09 -0700 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-05-08 14:08:12 +0200 |
| commit | a4995684a949cc1d28fbf09900c47c34b9427ecf (patch) | |
| tree | 39e08cb32dee46af6f9ea62ef32d4323e98d8ebc /net/bridge | |
| parent | 2f99aa31cd7a5d667f17dd2924c884c3d2c621ac (diff) | |
netfilter: bridge: stp fix reference to uninitialized data
The destination mac (destmac) is only valid if EBT_DESTMAC flag
is set. Fix by changing the order of the comparison to look for
the flag first.
Reported-by: syzbot+5c06e318fc558cc27823@syzkaller.appspotmail.com
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/bridge')
| -rw-r--r-- | net/bridge/netfilter/ebt_stp.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bridge/netfilter/ebt_stp.c b/net/bridge/netfilter/ebt_stp.c index 47ba98db145d..46c1fe7637ea 100644 --- a/net/bridge/netfilter/ebt_stp.c +++ b/net/bridge/netfilter/ebt_stp.c @@ -161,8 +161,8 @@ static int ebt_stp_mt_check(const struct xt_mtchk_param *par) /* Make sure the match only receives stp frames */ if (!par->nft_compat && (!ether_addr_equal(e->destmac, eth_stp_addr) || - !is_broadcast_ether_addr(e->destmsk) || - !(e->bitmask & EBT_DESTMAC))) + !(e->bitmask & EBT_DESTMAC) || + !is_broadcast_ether_addr(e->destmsk))) return -EINVAL; return 0; |