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| author | Ilya Maximets <i.maximets@samsung.com> | 2019-06-07 20:27:32 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-06-12 16:41:47 +0200 |
| commit | 01d76b5317003e019ace561a9b775f51aafdfdc4 (patch) | |
| tree | c448c473facb63750752105547c5b79576bd9b78 | |
| parent | f12dd75959b0138f94da8ddcf43f2f3cf277216d (diff) | |
| download | linux-stable-01d76b5317003e019ace561a9b775f51aafdfdc4.tar.gz linux-stable-01d76b5317003e019ace561a9b775f51aafdfdc4.tar.bz2 linux-stable-01d76b5317003e019ace561a9b775f51aafdfdc4.zip | |
xdp: check device pointer before clearing
We should not call 'ndo_bpf()' or 'dev_put()' with NULL argument.
Fixes: c9b47cc1fabc ("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>
| -rw-r--r-- | net/xdp/xdp_umem.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c index 2b18223e7eb8..9c6de4f114f8 100644 --- a/net/xdp/xdp_umem.c +++ b/net/xdp/xdp_umem.c @@ -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); |