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vdpa: Add queue index attr to vdpa_nl_policy for nlattr length check
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 queue index attr to avoid
such bugs.
Fixes: 13b00b1356
("vdpa: Add support for querying vendor statistics")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Cc: stable@vger.kernelorg
Message-Id: <20230727175757.73988-5-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -1249,6 +1249,7 @@ static const struct nla_policy vdpa_nl_policy[VDPA_ATTR_MAX + 1] = {
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[VDPA_ATTR_DEV_NET_CFG_MACADDR] = NLA_POLICY_ETH_ADDR,
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/* virtio spec 1.1 section 5.1.4.1 for valid MTU range */
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[VDPA_ATTR_DEV_NET_CFG_MTU] = NLA_POLICY_MIN(NLA_U16, 68),
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[VDPA_ATTR_DEV_QUEUE_INDEX] = { .type = NLA_U32 },
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[VDPA_ATTR_DEV_FEATURES] = { .type = NLA_U64 },
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};
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