Re: [PATCH net] vhost-net: fix use-after-free in vhost_net_flush

From: Sergei Shtylyov
Date: Thu Jun 20 2013 - 08:48:07 EST


On 20-06-2013 15:48, Michael S. Tsirkin wrote:

vhost_net_ubuf_put_and_wait has a confusing name:
it will actually also free it's argument.
Thus since commit 1280c27f8e29acf4af2da914e80ec27c3dbd5c01

Please also specify that commit's summary line in parens.

vhost_net_flush tries to use the argument after passing it
to vhost_net_ubuf_put_and_wait, this results
in use after free.
To fix, don't free the argument in vhost_net_ubuf_put_and_wait,
add an new API for callers that want to free ubufs.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

WBR, Sergei

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