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net/sched: act_pedit: Use flex_array_size() helper in memcpy()

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Make use of the flex_array_size() helper to calculate the size of a
flexible array member within an enclosing structure.

This helper offers defense-in-depth against potential integer
overflows, while at the same time makes it explicitly clear that
we are dealing with a flexible array member.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gustavo A. R. Silva 2020-07-29 22:17:00 -05:00 committed by David S. Miller
parent 10470c0d7e
commit a0d716d8e4
1 changed files with 1 additions and 2 deletions
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net/sched/act_pedit.c
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@ -436,8 +436,7 @@ static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
return -ENOBUFS;
spin_lock_bh(&p->tcf_lock);
memcpy(opt->keys, p->tcfp_keys,
p->tcfp_nkeys * sizeof(struct tc_pedit_key));
memcpy(opt->keys, p->tcfp_keys, flex_array_size(opt, keys, p->tcfp_nkeys));
opt->index = p->tcf_index;
opt->nkeys = p->tcfp_nkeys;
opt->flags = p->tcfp_flags;