From: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
commit 23954cb078febfc63a755301fe77e06bccdb4d2a upstream.
In routine wpa_supplicant_ioctl(), the user-controlled p->length is
checked to be at least the size of struct ieee_param size, but the code
does not detect the case where p->length is greater than the size
of the struct, thus a malicious user could be wasting kernel memory.
Fixes commit 554c0a3abf216 ("staging: Add rtl8723bs sdio wifi driver").
Reported by: Pietro Oliva <pietroliva@xxxxxxxxx>
Cc: Pietro Oliva <pietroliva@xxxxxxxxx>
Cc: Stable <stable@xxxxxxxxxxxxxxx>
Fixes: 554c0a3abf216 ("staging: Add rtl8723bs sdio wifi driver").
Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200210180235.21691-5-Larry.Finger@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
@@ -3495,7 +3495,7 @@ static int wpa_supplicant_ioctl(struct n
/* down(&ieee->wx_sem); */
- if (p->length < sizeof(struct ieee_param) || !p->pointer) {
+ if (!p->pointer || p->length != sizeof(struct ieee_param)) {
ret = -EINVAL;
goto out;
}
