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staging: rtl8723bs: Allocate full pwep structure

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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@linuxfoundation.org>
Cc: Fabio Aiuto <fabioaiuto83@gmail.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220608215512.1070847-1-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2022-06-08 14:55:12 -07:00 committed by Greg Kroah-Hartman
parent de0952f267
commit 67ea0a2adb
1 changed files with 4 additions and 2 deletions
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6
drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
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@ -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)
goto exit;