Patch "iio: adis_buffer: Fix out-of-bounds memory access" has been added to the 3.14-stable tree

Patch "iio: adis_buffer: Fix out-of-bounds memory access" has been added to the 3.14-stable tree

[gregkh]

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

    iio: adis_buffer: Fix out-of-bounds memory access

to the 3.14-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:
     iio-adis_buffer-fix-out-of-bounds-memory-access.patch
and it can be found in the queue-3.14 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 d590faf9e8f8509a0a0aa79c38e87fcc6b913248 Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Fri, 27 Nov 2015 14:55:56 +0100
Subject: iio: adis_buffer: Fix out-of-bounds memory access

From: Lars-Peter Clausen <lars@metafoo.de>

commit d590faf9e8f8509a0a0aa79c38e87fcc6b913248 upstream.

The SPI tx and rx buffers are both supposed to be scan_bytes amount of
bytes large and a common allocation is used to allocate both buffers. This
puts the beginning of the tx buffer scan_bytes bytes after the rx buffer.
The initialization of the tx buffer pointer is done adding scan_bytes to
the beginning of the rx buffer, but since the rx buffer is of type __be16
this will actually add two times as much and the tx buffer ends up pointing
after the allocated buffer.

Fix this by using scan_count, which is scan_bytes / 2, instead of
scan_bytes when initializing the tx buffer pointer.

Fixes: aacff892cbd5 ("staging:iio:adis: Preallocate transfer message")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iio/imu/adis_buffer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/imu/adis_buffer.c
+++ b/drivers/iio/imu/adis_buffer.c
@@ -43,7 +43,7 @@ int adis_update_scan_mode(struct iio_dev
 		return -ENOMEM;
 
 	rx = adis->buffer;
-	tx = rx + indio_dev->scan_bytes;
+	tx = rx + scan_count;
 
 	spi_message_init(&adis->msg);
 


Patches currently in stable-queue which might be from lars@metafoo.de are

queue-3.14/iio-ad5064-fix-ad5629-ad5669-shift.patch
queue-3.14/iio-adis_buffer-fix-out-of-bounds-memory-access.patch
queue-3.14/iio-ad7793-fix-ad7785-product-id.patch
queue-3.14/iio-ad5064-make-sure-ad5064_i2c_write-returns-0-on-success.patch