From: Lin Ma linma@zju.edu.cn

The vdpa_nl_policy structure is used to validate the nlattr when parsing the incoming nlmsg. It will ensure the attribute being described produces a valid nlattr pointer in info->attrs before entering into each handler in vdpa_nl_ops.

That is to say, the missing part in vdpa_nl_policy may lead to illegal nlattr after parsing, which could lead to OOB read just like CVE-2023-3773.

This patch adds the missing nla_policy for vdpa max vqp attr to avoid such bugs.

Fixes: ad69dd0bf26b ("vdpa: Introduce query of device config layout") Signed-off-by: Lin Ma linma@zju.edu.cn Cc: stable@vger.kernel.org --- drivers/vdpa/vdpa.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index 75f1df2b9d2a..f2f654fd84e5 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -1247,6 +1247,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = { [VDPA_ATTR_MGMTDEV_DEV_NAME] = { .type = NLA_STRING }, [VDPA_ATTR_DEV_NAME] = { .type = NLA_STRING }, [VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR, + [VDPA_ATTR_DEV_NET_CFG_MAX_VQP] = { .type = NLA_U16 }, /* virtio spec 1.1 section 5.1.4.1 for valid MTU range */ [VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68), [VDPA_ATTR_DEV_QUEUE_INDEX] = { .type = NLA_U32 },