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netfilter: x_tables: add counters allocation wrapper

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allows to have size checks in a single spot.
This is supposed to reduce oom situations when fuzz-testing xtables.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal
2018-02-27 19:42:33 +01:00
committed by Pablo Neira Ayuso
parent 9d5c12a7c0
commit c84ca954ac
5 changed files with 19 additions and 3 deletions
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include/linux/netfilter/x_tables.h
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@@ -301,6 +301,7 @@ int xt_data_to_user(void __user *dst, const void *src,
void *xt_copy_counters_from_user(const void __user *user, unsigned int len,
struct xt_counters_info *info, bool compat);
struct xt_counters *xt_counters_alloc(unsigned int counters);
struct xt_table *xt_register_table(struct net *net,
const struct xt_table *table,