From: Johannes Berg <[email protected]> Date: Mon, 16 Oct 2017 17:09:53 +0200
> From: Johannes Berg <[email protected]> > > It seems that it's possible to toggle NETLINK_F_EXT_ACK > through setsockopt() while another thread/CPU is building > a message inside netlink_ack(), which could then trigger > the WARN_ON()s I added since if it goes from being turned > off to being turned on between allocating and filling the > message, the skb could end up being too small. > > Avoid this whole situation by storing the value of this > flag in a separate variable and using that throughout the > function instead. > > Fixes: 2d4bc93368f5 ("netlink: extended ACK reporting") > Signed-off-by: Johannes Berg <[email protected]> Applied and queued up for -stable.
