[PATCH 5.4 038/135] staging: rtl8188eu: Fix potential security hole

From: Larry Finger <redacted>

commit 499c405b2b80bb3a04425ba3541d20305e014d3e upstream.

In routine rtw_hostapd_ioctl(), the user-controlled p->length is assumed
to be at least the size of struct ieee_param size, but this assumption is
never checked. This could result in out-of-bounds read/write on kernel
heap in case a p->length less than the size of struct ieee_param is
specified by the user. If p->length is allowed to be greater than the size
of the struct, then a malicious user could be wasting kernel memory.
Fixes commit a2c60d42d97c ("Add files for new driver - part 16").

Reported by: Pietro Oliva [off-list ref]
Cc: Pietro Oliva <redacted>
Cc: Stable <redacted>
Fixes: a2c60d42d97c ("staging: r8188eu: Add files for new driver - part 16")
Signed-off-by: Larry Finger <redacted>
Link: https://lore.kernel.org/r/20200210180235.21691-2-Larry.Finger@lwfinger.net (local)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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

@@ -2812,7 +2812,7 @@ static int rtw_hostapd_ioctl(struct net_
 		goto out;
 	}
 
-	if (!p->pointer) {
+	if (!p->pointer || p->length != sizeof(struct ieee_param)) {
 		ret = -EINVAL;
 		goto out;
 	}