Patch "gpio: Fix kernel stack leak to userspace" has been added to the 4.9-stable tree

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

gpio: Fix kernel stack leak to userspace

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
gpio-fix-kernel-stack-leak-to-userspace.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Linus Walleij <[email protected]>
Date: Mon, 22 Jan 2018 13:19:28 +0100
Subject: gpio: Fix kernel stack leak to userspace

From: Linus Walleij <[email protected]>

commit 24bd3efc9d1efb5f756a7c6f807a36ddb6adc671 upstream.

The GPIO event descriptor was leaking kernel stack to userspace because we don't zero the variable before use. Ooops. Fix this.

---
 drivers/gpio/gpiolib.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -705,6 +705,9 @@ static irqreturn_t lineevent_irq_thread(
 	struct gpioevent_data ge;
 	int ret, level;
 
+	/* Do not leak kernel stack to userspace */
+	memset(&ge, 0, sizeof(ge));
+
 	ge.timestamp = ktime_get_real_ns();
 	level = gpiod_get_value_cansleep(le->desc);
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/gpio-iop-add-missing-module_description-author-license.patch queue-4.9/tools-gpio-fix-build-error-with-musl-libc.patch queue-4.9/gpio-fix-kernel-stack-leak-to-userspace.patch queue-4.9/gpio-ath79-add-missing-module_description-license.patch queue-4.9/gpio-stmpe-i2c-transfer-are-forbiden-in-atomic-context.patch