diff mbox series

[12/47] netfilter: x_tables: limit allocation requests for blob rule heads

Message ID 20180330113914.18431-3-pablo@netfilter.org
State Accepted, archived
Delegated to: David Miller
Headers show
Series [01/47] netfilter: nf_tables: nf_tables_obj_lookup_byhandle() can be static | expand

Commit Message

Pablo Neira Ayuso March 30, 2018, 11:38 a.m. UTC 
From: Florian Westphal <fw@strlen.de>

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>
---
 net/netfilter/x_tables.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index dc68ac49614a..01f8e122e74e 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -894,6 +894,9 @@  EXPORT_SYMBOL(xt_check_entry_offsets);
  */
 unsigned int *xt_alloc_entry_offsets(unsigned int size)
 {
+	if (size > XT_MAX_TABLE_SIZE / sizeof(unsigned int))
+		return NULL;
+
 	return kvmalloc_array(size, sizeof(unsigned int), GFP_KERNEL | __GFP_ZERO);
 
 }