net/sched: mqprio: Add length check for TCA_MQPRIO_{MAX/MIN}_RATE64

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[ Upstream commit 6c58c8816a ]

The nla_for_each_nested parsing in function mqprio_parse_nlattr() does
not check the length of the nested attribute. This can lead to an
out-of-attribute read and allow a malformed nlattr (e.g., length 0) to
be viewed as 8 byte integer and passed to priv->max_rate/min_rate.

This patch adds the check based on nla_len() when check the nla_type(),
which ensures that the length of these two attribute must equals
sizeof(u64).

Fixes: 4e8b86c062 ("mqprio: Introduce new hardware offload mode and shaper in mqprio")
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Link: https://lore.kernel.org/r/20230725024227.426561-1-linma@zju.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Lin Ma 2023-07-25 10:42:27 +08:00 • committed by Greg Kroah-Hartman

parent 98f6bbdfc0

commit 95cf4fa31b

1 changed files with 14 additions and 0 deletions

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net/sched/sch_mqprio.c

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