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Date: Sat, 18 Jun 2022 09:51:36 +0200 From: Christophe JAILLET <christophe.jaillet@...adoo.fr> To: Kees Cook <keescook@...omium.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Fabio Aiuto <fabioaiuto83@...il.com>, Hans de Goede <hdegoede@...hat.com>, linux-staging@...ts.linux.dev, Michael Straube <straube.linux@...il.com>, Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] staging: rtl8723bs: Allocate full pwep structure Le 08/06/2022 à 23:55, Kees Cook a écrit : > The pwep allocation was always being allocated smaller than the true > structure size. Avoid this by always allocating the full structure. > Found with GCC 12 and -Warray-bounds: > > ../drivers/staging/rtl8723bs/os_dep/ioctl_linux.c: In function 'rtw_set_encryption': > ../drivers/staging/rtl8723bs/os_dep/ioctl_linux.c:591:29: warning: array subscript 'struct ndis_802_11_wep[0]' is partly outside array bounds of 'void[25]' [-Warray-bounds] > 591 | pwep->length = wep_total_len; > | ^~ > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> > Cc: Fabio Aiuto <fabioaiuto83@...il.com> > Cc: Hans de Goede <hdegoede@...hat.com> > Cc: linux-staging@...ts.linux.dev > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > 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. CJ > goto exit; >
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