From 9d5c12a7c08f67999772065afd50fb222072114e Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Tue, 27 Feb 2018 19:42:32 +0100 Subject: netfilter: x_tables: limit allocation requests for blob rule heads This is a very conservative limit (134217728 rules), but good enough to not trigger frequent oom from syzkaller. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/x_tables.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/netfilter/x_tables.c') diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index dc68ac4..01f8e12 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); } -- cgit v1.1