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| author | Vladyslav Tarasiuk <vladyslavt@mellanox.com> | 2019-12-06 13:51:05 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-06 11:58:45 -0800 |
| commit | 9f104c7736904ac72385bbb48669e0c923ca879b (patch) | |
| tree | 7b1ea2418814ac3fdeafca6b51a5f191d6de6d0d /net | |
| parent | f421031e3ff0dd288a6e1bbde9aa41a25bb814e6 (diff) | |
| download | linux-9f104c7736904ac72385bbb48669e0c923ca879b.tar.gz linux-9f104c7736904ac72385bbb48669e0c923ca879b.tar.bz2 linux-9f104c7736904ac72385bbb48669e0c923ca879b.zip | |
mqprio: Fix out-of-bounds access in mqprio_dump
When user runs a command like
tc qdisc add dev eth1 root mqprio
KASAN stack-out-of-bounds warning is emitted.
Currently, NLA_ALIGN macro used in mqprio_dump provides too large
buffer size as argument for nla_put and memcpy down the call stack.
The flow looks like this:
1. nla_put expects exact object size as an argument;
2. Later it provides this size to memcpy;
3. To calculate correct padding for SKB, nla_put applies NLA_ALIGN
macro itself.
Therefore, NLA_ALIGN should not be applied to the nla_put parameter.
Otherwise it will lead to out-of-bounds memory access in memcpy.
Fixes: 4e8b86c06269 ("mqprio: Introduce new hardware offload mode and shaper in mqprio")
Signed-off-by: Vladyslav Tarasiuk <vladyslavt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_mqprio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c index de4e00a58bc6..8766ab5b8788 100644 --- a/net/sched/sch_mqprio.c +++ b/net/sched/sch_mqprio.c @@ -434,7 +434,7 @@ static int mqprio_dump(struct Qdisc *sch, struct sk_buff *skb) opt.offset[tc] = dev->tc_to_txq[tc].offset; } - if (nla_put(skb, TCA_OPTIONS, NLA_ALIGN(sizeof(opt)), &opt)) + if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt)) goto nla_put_failure; if ((priv->flags & TC_MQPRIO_F_MODE) && |