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; | ^~
Unified · Split
| @@ -90,7 +90,8 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param, · 89 unmodified lines | ||
| 90 | 90 | if (wep_key_len > 0) { |
| 91 | 91 | wep_key_len = wep_key_len <= 5 ? 5 : 13; |
| 92 | 92 | wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material); |
| 93 | − pwep = kzalloc(wep_total_len, GFP_KERNEL); | |
| 93 | + /* Allocate a full structure to avoid potentially running off the end. */ | |
| 94 | + pwep = kzalloc(sizeof(*pwep), GFP_KERNEL); | |
| 94 | 95 | if (!pwep) { |
| 95 | 96 | ret = -ENOMEM; |
| 96 | 97 | goto exit; |
| @@ -582,7 +583,8 @@ static int rtw_set_encryption(struct net_device *dev, struct ieee_param *param, · 485 unmodified lines | ||
| 582 | 583 | if (wep_key_len > 0) { |
| 583 | 584 | wep_key_len = wep_key_len <= 5 ? 5 : 13; |
| 584 | 585 | wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, key_material); |
| 585 | − pwep = kzalloc(wep_total_len, GFP_KERNEL); | |
| 586 | + /* Allocate a full structure to avoid potentially running off the end. */ | |
| 587 | + pwep = kzalloc(sizeof(*pwep), GFP_KERNEL); | |
| 586 | 588 | if (!pwep) |
| 587 | 589 | goto exit; |
| 588 | 590 | |