netfilter: x_tables: assert minimum target size
commit a08e4e190b866579896c09af59b3bdca821da2cd upstream. The target size includes the size of the xt_entry_target struct. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Willy Tarreau <w@1wt.eu>
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@ -587,6 +587,9 @@ int xt_check_entry_offsets(const void *base,
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return -EINVAL;
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t = (void *)(e + target_offset);
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if (t->u.target_size < sizeof(*t))
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return -EINVAL;
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if (target_offset + t->u.target_size > next_offset)
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return -EINVAL;
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