Re: [PATCH] staging: rtl8723bs: Allocate full pwep structure

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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@xxxxxxxxxxxxxxxxxxx>
Cc: Fabio Aiuto <fabioaiuto83@xxxxxxxxx>
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: linux-staging@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
  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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