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    Subject[PATCH 5.10 022/157] vhost-vdpa: set v->config_ctx to NULL if eventfd_ctx_fdget() fails
    Date
    From: Stefano Garzarella <sgarzare@redhat.com>

    commit 0bde59c1723a29e294765c96dbe5c7fb639c2f96 upstream.

    In vhost_vdpa_set_config_call() if eventfd_ctx_fdget() fails the
    'v->config_ctx' contains an error instead of a valid pointer.

    Since we consider 'v->config_ctx' valid if it is not NULL, we should
    set it to NULL in this case to avoid to use an invalid pointer in
    other functions such as vhost_vdpa_config_put().

    Fixes: 776f395004d8 ("vhost_vdpa: Support config interrupt in vdpa")
    Cc: lingshan.zhu@intel.com
    Cc: stable@vger.kernel.org
    Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
    Link: https://lore.kernel.org/r/20210311135257.109460-3-sgarzare@redhat.com
    Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    Acked-by: Jason Wang <jasowang@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/vhost/vdpa.c | 8 ++++++--
    1 file changed, 6 insertions(+), 2 deletions(-)

    --- a/drivers/vhost/vdpa.c
    +++ b/drivers/vhost/vdpa.c
    @@ -335,8 +335,12 @@ static long vhost_vdpa_set_config_call(s
    if (!IS_ERR_OR_NULL(ctx))
    eventfd_ctx_put(ctx);

    - if (IS_ERR(v->config_ctx))
    - return PTR_ERR(v->config_ctx);
    + if (IS_ERR(v->config_ctx)) {
    + long ret = PTR_ERR(v->config_ctx);
    +
    + v->config_ctx = NULL;
    + return ret;
    + }

    v->vdpa->config->set_config_cb(v->vdpa, &cb);


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