[PATCH AUTOSEL 5.1 54/95] xdp: check device pointer before clearing
From: Sasha Levin <sashal@kernel.org>
Date: 2019-06-27 00:33:38
Also in:
bpf, lkml, stable
Subsystem:
networking [general], the rest, xdp sockets (af_xdp) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Magnus Karlsson, Maciej Fijalkowski
From: Ilya Maximets <redacted>
[ Upstream commit 01d76b5317003e019ace561a9b775f51aafdfdc4 ]
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 <redacted>
Acked-by: Jonathan Lemon <redacted>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/xdp/xdp_umem.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
index 989e52386c35..2f7e2c33a812 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);
--
2.20.1