[V2,6/9] vhost_net: zerocopy: fix possible NULL pointer dereference of vq->bufs
diff mbox series

Message ID 20120502034223.11782.31222.stgit@amd-6168-8-1.englab.nay.redhat.com
State New, archived
Headers show
Series
  • vhost/macvtap zeropcopy fixes
Related show

Commit Message

Jason Wang May 2, 2012, 3:42 a.m. UTC
When we want to disable vhost_net backend while there's a tx work, a possible
NULL pointer defernece may happen we we try to deference the vq->bufs after
vhost_net_set_backend() assign a NULL to it.

As suggested by Michael, fix this by checking the vq->bufs instead of
vhost_sock_zcopy().
---
 drivers/vhost/net.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Patch
diff mbox series

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index f0da2c3..ffdc0d8 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -166,7 +166,7 @@  static void handle_tx(struct vhost_net *net)
 	if (wmem < sock->sk->sk_sndbuf / 2)
 		tx_poll_stop(net);
 	hdr_size = vq->vhost_hlen;
-	zcopy = vhost_sock_zcopy(sock);
+	zcopy = vq->ubufs;
 
 	for (;;) {
 		/* Release DMAs done buffers first */