From: Jakub Sitnicki Date: Wed, 9 Aug 2017 15:39:12 +0000 (+0200) Subject: rtnelink: Move link dump consistency check out of the loop X-Git-Tag: v4.14-rc1~130^2~271 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d0225784be6c9bdfb05149ebc30bf9fc1fdbce3a;p=platform%2Fkernel%2Flinux-rpi3.git rtnelink: Move link dump consistency check out of the loop Calls to rtnl_dump_ifinfo() are protected by RTNL lock. So are the {list,unlist}_netdevice() calls where we bump the net->dev_base_seq number. For this reason net->dev_base_seq can't change under out feet while we're looping over links in rtnl_dump_ifinfo(). So move the check for net->dev_base_seq change (since the last time we were called) out of the loop. This way we avoid giving a wrong impression that there are concurrent updates to the link list going on while we're iterating over them. Signed-off-by: Jakub Sitnicki Signed-off-by: David S. Miller --- diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 9e9f141..a78fd61 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1621,8 +1621,6 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) s_h = cb->args[0]; s_idx = cb->args[1]; - cb->seq = net->dev_base_seq; - /* A hack to preserve kernel<->userspace interface. * The correct header is ifinfomsg. It is consistent with rtnl_getlink. * However, before Linux v3.9 the code here assumed rtgenmsg and that's @@ -1668,8 +1666,6 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) goto out_err; } - - nl_dump_check_consistent(cb, nlmsg_hdr(skb)); cont: idx++; } @@ -1679,6 +1675,8 @@ out: out_err: cb->args[1] = idx; cb->args[0] = h; + cb->seq = net->dev_base_seq; + nl_dump_check_consistent(cb, nlmsg_hdr(skb)); return err; }