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SubjectRe: [PATCH] staging: rtl8723bs: Allocate full pwep structure
On Sat, Jun 18, 2022 at 09:51:36AM +0200, Christophe JAILLET wrote:
> > diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> > index ece97e37ac91..30374a820496 100644
> > --- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> > +++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
> > @@ -90,7 +90,8 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param,
> > if (wep_key_len > 0) {
> > wep_key_len = wep_key_len <= 5 ? 5 : 13;
> > wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material);
> > - pwep = kzalloc(wep_total_len, GFP_KERNEL);
> > + /* Allocate a full structure to avoid potentially running off the end. */
> > + pwep = kzalloc(sizeof(*pwep), GFP_KERNEL);
> > if (!pwep) {
> > ret = -ENOMEM;
> > goto exit;
> > @@ -582,7 +583,8 @@ static int rtw_set_encryption(struct net_device *dev, struct ieee_param *param,
> > if (wep_key_len > 0) {
> > wep_key_len = wep_key_len <= 5 ? 5 : 13;
> > wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material);
> > - pwep = kzalloc(wep_total_len, GFP_KERNEL);
> > + /* Allocate a full structure to avoid potentially running off the end. */
> > + pwep = kzalloc(sizeof(*pwep), GFP_KERNEL);
> > if (!pwep)
>
> Hi,
>
> while at it (and un-related tyo your patch), I think that 'ret' should also
> be updated here, otherwise we return 0.
>

Too late. Smatch does catch that bug btw.

drivers/staging/r8188eu/os_dep/ioctl_linux.c:409 wpa_set_encryption() warn: missing error code here? 'kzalloc()' failed. 'ret' = '0'

regards,
dan carpenter

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