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[V2 PATCH 6/9] vhost_net: zerocopy: fix possible NULL pointer dereference of vq->bufs

 

 

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jasowang at redhat

May 1, 2012, 8:42 PM

Post #1 of 1 (52 views)
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[V2 PATCH 6/9] vhost_net: zerocopy: fix possible NULL pointer dereference of vq->bufs

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(-)

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 */

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