patch "iio: adis_buffer: Fix out-of-bounds memory access" added to staging-linus

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 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: Lars-Peter Clausen <[email protected]>
Date: Fri, 27 Nov 2015 14:55:56 +0100
Subject: iio: adis_buffer: Fix out-of-bounds memory access

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.

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

index cb32b593f1c5..36607d52fee0 100644
@@ -43,7 +43,7 @@ int adis_update_scan_mode(struct iio_dev *indio_dev,
 		return -ENOMEM;
 
 	rx = adis->buffer;
-	tx = rx + indio_dev->scan_bytes;
+	tx = rx + scan_count;
 
 	spi_message_init(&adis->msg);
 

2.6.4