Use array_size() helper instead of the open-coded version in copy_to_user(). These sorts of multiplication factors need to be wrapped in array_size().
Link: https://github.com/KSPP/linux/issues/160 Signed-off-by: Gustavo A. R. Silva <[email protected]> --- net/bridge/br_ioctl.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c index 793b0db9d9a3..49c268871fc1 100644 --- a/net/bridge/br_ioctl.c +++ b/net/bridge/br_ioctl.c @@ -71,7 +71,8 @@ static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, num = br_fdb_fillbuf(br, buf, maxnum, offset); if (num > 0) { - if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry))) + if (copy_to_user(userbuf, buf, + array_size(num, sizeof(struct __fdb_entry)))) num = -EFAULT; } kfree(buf); @@ -188,7 +189,7 @@ int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user return -ENOMEM; get_port_ifindices(br, indices, num); - if (copy_to_user(argp, indices, num * sizeof(int))) + if (copy_to_user(argp, indices, array_size(num, sizeof(int)))) num = -EFAULT; kfree(indices); return num; @@ -336,7 +337,8 @@ static int old_deviceless(struct net *net, void __user *uarg) args[2] = get_bridge_ifindices(net, indices, args[2]); - ret = copy_to_user(uarg, indices, args[2]*sizeof(int)) + ret = copy_to_user(uarg, indices, + array_size(args[2], sizeof(int))) ? -EFAULT : args[2]; kfree(indices); -- 2.27.0
