The target size includes the size of the xt_entry_target struct.
Signed-off-by: Florian Westphal <[email protected]>
---
net/netfilter/x_tables.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 1f44bfa..ec1b718 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -568,6 +568,9 @@ int xt_check_entry_offsets(const void *base,
return -EINVAL;
t = (void *)(e + target_offset);
+ if (t->u.target_size < sizeof(*t))
+ return -EINVAL;
+
if (target_offset + t->u.target_size > next_offset)
return -EINVAL;
--
2.7.3
--
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