On 30 Sep 2019, at 6:30, Magnus Karlsson wrote:
Fixes a crash in poll() when an AF_XDP socket is opened in copy mode
with the XDP_USE_NEED_WAKEUP flag set and the bound device does not
have ndo_xsk_wakeup defined. Avoid trying to call the non-existing ndo
and instead call the internal xsk sendmsg functionality to send
packets in the same way (from the application's point of view) as
calling sendmsg() in any mode or poll() in zero-copy mode would have
done. The application should behave in the same way independent on if
zero-copy mode or copy-mode is used.
Fixes: 77cd0d7b3f25 ("xsk: add support for need_wakeup flag in AF_XDP
rings")
Reported-by: syzbot+a5765ed8cdb1cca4d249@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
Acked-by: Jonathan Lemon <jonathan.lemon@xxxxxxxxx>
