patch "staging: rtl8188eu: Fix potential security hole" added to staging-linus

This is a note to let you know that I've just added the patch titled

staging: rtl8188eu: Fix potential security hole

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 499c405b2b80bb3a04425ba3541d20305e014d3e Mon Sep 17 00:00:00 2001
From: Larry Finger <[email protected]>
Date: Mon, 10 Feb 2020 12:02:30 -0600
Subject: staging: rtl8188eu: Fix potential security hole

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 <[email protected]>

---
 drivers/staging/rtl8188eu/os_dep/ioctl_linux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 9b6ea86d1dcf..7d21f5799640 100644
@@ -2796,7 +2796,7 @@ static int rtw_hostapd_ioctl(struct net_device *dev, struct iw_point *p)
 		goto out;
 	}
 
-	if (!p->pointer) {
+	if (!p->pointer || p->length != sizeof(struct ieee_param)) {
 		ret = -EINVAL;
 		goto out;
 	}

2.25.0