vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check

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commit 5d6ba607d6 upstream.

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: ad69dd0bf2 ("vdpa: Introduce query of device config layout")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Cc: stable@vger.kernel.org
Message-Id: <20230727175757.73988-7-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Lin Ma 2023-07-27 20:57:52 +03:00 • committed by Greg Kroah-Hartman

parent ccb533b707

commit ea65e8b5e6

1 changed files with 1 additions and 0 deletions

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drivers/vdpa/vdpa.c

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