[Bridge] [PATCH] net: bridge: fix potential NULL pointer dereference
Gustavo A. R. Silva
garsilva at embeddedor.com
Tue Jun 6 03:13:05 UTC 2017
Hi Nikolay,
Quoting Nikolay Aleksandrov <nikolay at cumulusnetworks.com>:
> On 06/06/17 00:30, Gustavo A. R. Silva wrote:
>> Add NULL check before dereferencing pointer _p_ inside br_afspec().
>>
>> Addresses-Coverity-ID: 1401872
>> Signed-off-by: Gustavo A. R. Silva <garsilva at embeddedor.com>
>> ---
>> net/bridge/br_netlink.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>> index 1e63ec4..ad85a9c 100644
>> --- a/net/bridge/br_netlink.c
>> +++ b/net/bridge/br_netlink.c
>> @@ -776,7 +776,7 @@ int br_setlink(struct net_device *dev, struct
>> nlmsghdr *nlh, u16 flags)
>> goto out;
>> }
>>
>> - if (afspec) {
>> + if (p && afspec) {
>> err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
>> afspec, RTM_SETLINK);
>> }
>>
>
> While I see a possible issue with the new bridge tunnel code (+CC
> Roopa), this is
> the wrong fix because there are legitimate use cases where p is null
> and br_afspec
> is called.
> We need to change the p->flags check in br_afspec()'s
> IFLA_BRIDGE_VLAN_TUNNEL_INFO case
> to check for a NULL p first.
>
You're right. I got it.
> Thanks for the report!
Sure thing, glad to help.
Thank you!
--
Gustavo A. R. Silva
More information about the Bridge
mailing list