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xdp: check device pointer before clearing

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We should not call 'ndo_bpf()' or 'dev_put()' with NULL argument.

Fixes: c9b47cc1fa ("xsk: fix bug when trying to use both copy and zero-copy on one queue id")
Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Ilya Maximets 2019-06-07 20:27:32 +03:00 committed by Daniel Borkmann
parent f12dd75959
commit 01d76b5317
1 changed files with 6 additions and 5 deletions
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11
net/xdp/xdp_umem.c
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@ -143,6 +143,9 @@ static void xdp_umem_clear_dev(struct xdp_umem *umem)
struct netdev_bpf bpf;
int err;
if (!umem->dev)
return;
if (umem->zc) {
bpf.command = XDP_SETUP_XSK_UMEM;
bpf.xsk.umem = NULL;
@ -156,11 +159,9 @@ static void xdp_umem_clear_dev(struct xdp_umem *umem)
WARN(1, "failed to disable umem!\n");
}
if (umem->dev) {
rtnl_lock();
xdp_clear_umem_at_qid(umem->dev, umem->queue_id);
rtnl_unlock();
}
rtnl_lock();
xdp_clear_umem_at_qid(umem->dev, umem->queue_id);
rtnl_unlock();
if (umem->zc) {
dev_put(umem->dev);