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netfilter: x_tables: limit allocation requests for blob rule heads 

commit 9d5c12a7c0 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Florian Westphal 2018-02-27 19:42:32 +01:00 committed by Greg Kroah-Hartman
parent 764f2162d9
commit 5bcf169444
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/x_tables.c
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@ -819,6 +819,9 @@ 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);
}