Hi, Dan, Thanks for your review. I noticed there is no error handling in the origin design (this call chain). go_add_group_info_attr returns a len-like value indicating the length of pbuf. I don't think throwing an error to the caller is a good idea, the caller doesn't seem to care about it. So inserting a netdev_dbg or pr_debug here might be enough. Do you have a better idea? Best regards, Kang Chen On Mon, Feb 27, 2023 at 12:47 PM Dan Carpenter <error27@xxxxxxxxx> wrote: > > On Sun, Feb 26, 2023 at 09:25:00PM +0800, Kang Chen wrote: > > kzalloc may fails, pdata_attr might be null and will cause > > illegal address access later. > > > > Signed-off-by: Kang Chen <void0red@xxxxxxxxx> > > --- > > drivers/staging/r8188eu/core/rtw_p2p.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/drivers/staging/r8188eu/core/rtw_p2p.c b/drivers/staging/r8188eu/core/rtw_p2p.c > > index 93d3c9c43..802e1170a 100644 > > --- a/drivers/staging/r8188eu/core/rtw_p2p.c > > +++ b/drivers/staging/r8188eu/core/rtw_p2p.c > > @@ -31,6 +31,8 @@ static u32 go_add_group_info_attr(struct wifidirect_info *pwdinfo, u8 *pbuf) > > struct sta_priv *pstapriv = &padapter->stapriv; > > > > pdata_attr = kzalloc(MAX_P2P_IE_LEN, GFP_KERNEL); > > + if (!pdata_attr) > > + return 0; > > Return success here is not a good thing. We have to fix the caller to > check for errors. (Fixing a bug half way just makes it harder to find > the bug so it makes the situation worse). > > regards, > dan carpenter >
