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authorFlorian Westphal <fw@strlen.de>2018-06-07 21:34:43 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2018-06-08 12:40:56 +0200
commitc568503ef02030f169c9e19204def610a3510918 (patch)
treeb0ba7bf264106a74e9efe06c39cf401a810ffad4 /net/bridge
parent64e6dd1fb2f1ed799f317dc34aa6e251c64f4981 (diff)
downloadlinux-c568503ef02030f169c9e19204def610a3510918.tar.bz2
netfilter: x_tables: initialise match/target check parameter struct
syzbot reports following splat: BUG: KMSAN: uninit-value in ebt_stp_mt_check+0x24b/0x450 net/bridge/netfilter/ebt_stp.c:162 ebt_stp_mt_check+0x24b/0x450 net/bridge/netfilter/ebt_stp.c:162 xt_check_match+0x1438/0x1650 net/netfilter/x_tables.c:506 ebt_check_match net/bridge/netfilter/ebtables.c:372 [inline] ebt_check_entry net/bridge/netfilter/ebtables.c:702 [inline] The uninitialised access is xt_mtchk_param->nft_compat ... which should be set to 0. Fix it by zeroing the struct beforehand, same for tgchk. ip(6)tables targetinfo uses c99-style initialiser, so no change needed there. Reported-by: syzbot+da4494182233c23a5fcf@syzkaller.appspotmail.com Fixes: 55917a21d0cc0 ("netfilter: x_tables: add context to know if extension runs from nft_compat") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/netfilter/ebtables.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 08a65e4a77d0..ead123dab05e 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -700,6 +700,8 @@ ebt_check_entry(struct ebt_entry *e, struct net *net,
}
i = 0;
+ memset(&mtpar, 0, sizeof(mtpar));
+ memset(&tgpar, 0, sizeof(tgpar));
mtpar.net = tgpar.net = net;
mtpar.table = tgpar.table = name;
mtpar.entryinfo = tgpar.entryinfo = e;