diff options
| -rw-r--r-- | net/bridge/br_ioctl.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c index 4e4119a1213..4c61a7e0a86 100644 --- a/net/bridge/br_ioctl.c +++ b/net/bridge/br_ioctl.c @@ -58,12 +58,13 @@ static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, { int num; void *buf; - size_t size = maxnum * sizeof(struct __fdb_entry); + size_t size; - if (size > PAGE_SIZE) { - size = PAGE_SIZE; + /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ + if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); - } + + size = maxnum * sizeof(struct __fdb_entry); buf = kmalloc(size, GFP_USER); if (!buf) |