[09/64] staging: rtl8723bs: Avoid field-overflowing memcpy()

Message ID 20210727205855.411487-10-keescook@chromium.org
State New
Headers show
Series
  • Introduce strict memcpy() bounds checking
Related show

Commit Message

Kees Cook July 27, 2021, 8:58 p.m.
In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring fields.

Adjust memcpy() destination to be the named structure itself, rather than
the first member, allowing memcpy() to correctly reason about the size.

"objdump -d" shows no object code changes.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/staging/rtl8723bs/core/rtw_mlme.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Greg Kroah-Hartman July 28, 2021, 5:46 a.m. | #1
On Tue, Jul 27, 2021 at 01:58:00PM -0700, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy(), memmove(), and memset(), avoid
> intentionally writing across neighboring fields.
> 
> Adjust memcpy() destination to be the named structure itself, rather than
> the first member, allowing memcpy() to correctly reason about the size.
> 
> "objdump -d" shows no object code changes.
> 
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  drivers/staging/rtl8723bs/core/rtw_mlme.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)


Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Patch

diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme.c b/drivers/staging/rtl8723bs/core/rtw_mlme.c
index a0c19253095d..fbd6e3d16323 100644
--- a/drivers/staging/rtl8723bs/core/rtw_mlme.c
+++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c
@@ -2390,7 +2390,7 @@  unsigned int rtw_restructure_ht_ie(struct adapter *padapter, u8 *in_ie, u8 *out_
 	}
 
 	/* fill default supported_mcs_set */
-	memcpy(ht_capie.mcs.rx_mask, pmlmeext->default_supported_mcs_set, 16);
+	memcpy(&ht_capie.mcs, pmlmeext->default_supported_mcs_set, 16);
 
 	/* update default supported_mcs_set */
 	rtw_hal_get_hwreg(padapter, HW_VAR_RF_TYPE, (u8 *)(&rf_type));