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netfilter: bridge: stp fix reference to uninitialized data

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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>
This commit is contained in:
Stephen Hemminger 2018-04-27 11:16:09 -07:00 committed by Pablo Neira Ayuso
parent 2f99aa31cd
commit a4995684a9
1 changed files with 2 additions and 2 deletions
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4
net/bridge/netfilter/ebt_stp.c
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@ -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;