Hi Xiaohui, On Wed, Dec 9, 2020 at 12:07 AM Xiaohui Zhang <ruc_zhangxiaohui@xxxxxxx> wrote: > > From: Zhang Xiaohui <ruc_zhangxiaohui@xxxxxxx> > > mwifiex_config_scan() calls memcpy() without checking > the destination size may trigger a buffer overflower, > which a local user could use to cause denial of service > or the execution of arbitrary code. > Fix it by putting the length check before calling memcpy(). > > Signed-off-by: Zhang Xiaohui <ruc_zhangxiaohui@xxxxxxx> > --- > drivers/net/wireless/marvell/mwifiex/scan.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c > index c2a685f63..b1d90678f 100644 > --- a/drivers/net/wireless/marvell/mwifiex/scan.c > +++ b/drivers/net/wireless/marvell/mwifiex/scan.c > @@ -930,6 +930,8 @@ mwifiex_config_scan(struct mwifiex_private *priv, > "DIRECT-", 7)) > wildcard_ssid_tlv->max_ssid_length = 0xfe; > > + if (ssid_len > 1) > + ssid_len = 1; > memcpy(wildcard_ssid_tlv->ssid, > user_scan_in->ssid_list[i].ssid, ssid_len); Can ssid_len ever be 0 here? If it can't, should we just set ssid_len to 1 unconditionally? If it can, should we just skip the memcpy as it won't do anything? Thanks, -- Julian Calaby Email: julian.calaby@xxxxxxxxx Profile: http://www.google.com/profiles/julian.calaby/
