diff options
| author | Florian Westphal <fw@strlen.de> | 2018-02-27 19:42:32 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-03-05 23:15:43 +0100 |
| commit | 9d5c12a7c08f67999772065afd50fb222072114e (patch) | |
| tree | 3fc6bbb9e424e03b5586b585a7e1387e5ba80adf /net/netfilter/x_tables.c | |
| parent | 19926968ea86a286aa6fbea16ee3f2e7442f10f0 (diff) | |
| download | linux-9d5c12a7c08f67999772065afd50fb222072114e.tar.gz | |
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 <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/x_tables.c')
| -rw-r--r-- | net/netfilter/x_tables.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c index dc68ac49614a9..01f8e122e74ee 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); } |