From: Larry Finger <Larry.Finger@xxxxxxxxxxxx> commit 4ddf8ab8d15ddbc52eefb44eb64e38466ce1f70f 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 a2c60d42d97c ("Add files for new driver - part 16"). Reported by: Pietro Oliva <pietroliva@xxxxxxxxx> Cc: Pietro Oliva <pietroliva@xxxxxxxxx> Cc: Stable <stable@xxxxxxxxxxxxxxx> Fixes commit a2c60d42d97c ("Add files for new driver - part 16"). Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200210180235.21691-4-Larry.Finger@xxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/rtl8188eu/os_dep/ioctl_linux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c +++ b/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c @@ -2011,7 +2011,7 @@ static int wpa_supplicant_ioctl(struct n struct ieee_param *param; uint ret = 0; - if (p->length < sizeof(struct ieee_param) || !p->pointer) { + if (!p->pointer || p->length != sizeof(struct ieee_param)) { ret = -EINVAL; goto out; }