diff mbox

[nf,05/17] netfilter: x_tables: assert minimum target size

Message ID 1459513057-30652-6-git-send-email-fw@strlen.de
State Accepted
Delegated to: Pablo Neira
Headers show

Commit Message

Florian Westphal April 1, 2016, 12:17 p.m. UTC 
The target size includes the size of the xt_entry_target struct.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 net/netfilter/x_tables.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox

Patch

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;