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netfilter: x_tables: limit allocation requests for blob rule heads
This is a very conservative limit (134217728 rules), but good enough to not trigger frequent oom from syzkaller. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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@ -894,6 +894,9 @@ EXPORT_SYMBOL(xt_check_entry_offsets);
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*/
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unsigned int *xt_alloc_entry_offsets(unsigned int size)
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{
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if (size > XT_MAX_TABLE_SIZE / sizeof(unsigned int))
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return NULL;
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return kvmalloc_array(size, sizeof(unsigned int), GFP_KERNEL | __GFP_ZERO);
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}
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