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

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>
This commit is contained in:
Lin Ma 2023-07-25 10:42:27 +08:00 committed by Jakub Kicinski
parent 0f0fa27b87
commit 6c58c8816a
1 changed files with 14 additions and 0 deletions
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14
net/sched/sch_mqprio.c
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@ -290,6 +290,13 @@ static int mqprio_parse_nlattr(struct Qdisc *sch, struct tc_mqprio_qopt *qopt,
"Attribute type expected to be TCA_MQPRIO_MIN_RATE64");
return -EINVAL;
}
if (nla_len(attr) != sizeof(u64)) {
NL_SET_ERR_MSG_ATTR(extack, attr,
"Attribute TCA_MQPRIO_MIN_RATE64 expected to have 8 bytes length");
return -EINVAL;
}
if (i >= qopt->num_tc)
break;
priv->min_rate[i] = nla_get_u64(attr);
@ -312,6 +319,13 @@ static int mqprio_parse_nlattr(struct Qdisc *sch, struct tc_mqprio_qopt *qopt,
"Attribute type expected to be TCA_MQPRIO_MAX_RATE64");
return -EINVAL;
}
if (nla_len(attr) != sizeof(u64)) {
NL_SET_ERR_MSG_ATTR(extack, attr,
"Attribute TCA_MQPRIO_MAX_RATE64 expected to have 8 bytes length");
return -EINVAL;
}
if (i >= qopt->num_tc)
break;
priv->max_rate[i] = nla_get_u64(attr);