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authorThomas Graf <tgraf@suug.ch>2014-11-26 15:42:16 +0300
committerDavid S. Miller <davem@davemloft.net>2014-11-26 23:29:00 +0300
commit6e8d1c55454574a22b3e8e263b1a12888909b033 (patch)
tree91b922df0732c107d37e70509684b00bc79ea22e /net
parent571dcfde23712b92e45a126f415d9424af0c2886 (diff)
downloadlinux-6e8d1c55454574a22b3e8e263b1a12888909b033.tar.xz
bridge: Validate IFLA_BRIDGE_FLAGS attribute length
Payload is currently accessed blindly and may exceed valid message boundaries. Fixes: 407af3299 ("bridge: Add netlink interface to configure vlans on bridge ports") Cc: Vlad Yasevich <vyasevic@redhat.com> Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/rtnetlink.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a6882686ca3a..5a853f8fad6c 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2798,6 +2798,9 @@ static int rtnl_bridge_setlink(struct sk_buff *skb, struct nlmsghdr *nlh)
if (br_spec) {
nla_for_each_nested(attr, br_spec, rem) {
if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
+ if (nla_len(attr) < sizeof(flags))
+ return -EINVAL;
+
have_flags = true;
flags = nla_get_u16(attr);
break;
@@ -2868,6 +2871,9 @@ static int rtnl_bridge_dellink(struct sk_buff *skb, struct nlmsghdr *nlh)
if (br_spec) {
nla_for_each_nested(attr, br_spec, rem) {
if (nla_type(attr) == IFLA_BRIDGE_FLAGS) {
+ if (nla_len(attr) < sizeof(flags))
+ return -EINVAL;
+
have_flags = true;
flags = nla_get_u16(attr);
break;