Patch "HID: core: Avoid uninitialized buffer access" has been added to the 4.3-stable tree

Patch "HID: core: Avoid uninitialized buffer access" has been added to the 4.3-stable tree

[gregkh]

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

    HID: core: Avoid uninitialized buffer access

to the 4.3-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:
     hid-core-avoid-uninitialized-buffer-access.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 79b568b9d0c7c5d81932f4486d50b38efdd6da6d Mon Sep 17 00:00:00 2001
From: Richard Purdie <richard.purdie@linuxfoundation.org>
Date: Fri, 18 Sep 2015 16:31:33 -0700
Subject: HID: core: Avoid uninitialized buffer access

From: Richard Purdie <richard.purdie@linuxfoundation.org>

commit 79b568b9d0c7c5d81932f4486d50b38efdd6da6d upstream.

hid_connect adds various strings to the buffer but they're all
conditional. You can find circumstances where nothing would be written
to it but the kernel will still print the supposedly empty buffer with
printk. This leads to corruption on the console/in the logs.

Ensure buf is initialized to an empty string.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
[dvhart: Initialize string to "" rather than assign buf[0] = NULL;]
Cc: Jiri Kosina <jikos@kernel.org>
Cc: linux-input@vger.kernel.org
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/hid/hid-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1611,7 +1611,7 @@ int hid_connect(struct hid_device *hdev,
 		"Multi-Axis Controller"
 	};
 	const char *type, *bus;
-	char buf[64];
+	char buf[64] = "";
 	unsigned int i;
 	int len;
 	int ret;


Patches currently in stable-queue which might be from richard.purdie@linuxfoundation.org are

queue-4.3/hid-core-avoid-uninitialized-buffer-access.patch