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netfilter: ebtables: abort if next_offset is too small
next_offset must be > 0, otherwise this loops forever. The offset also contains the size of the ebt_entry structure itself, so anything smaller is invalid. Signed-off-by: Florian Westphal <fwestphal@astaro.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
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@ -444,6 +444,8 @@ static int ebt_verify_pointers(const struct ebt_replace *repl,
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break;
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if (left < e->next_offset)
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break;
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if (e->next_offset < sizeof(struct ebt_entry))
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return -EINVAL;
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offset += e->next_offset;
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}
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}
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