Patch "spi: fsl-espi: avoid processing uninitalized data on error" has been added to the 4.8-stable tree

Patch "spi: fsl-espi: avoid processing uninitalized data on error" has been added to the 4.8-stable tree

[gregkh]

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

    spi: fsl-espi: avoid processing uninitalized data on error

to the 4.8-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:
     spi-fsl-espi-avoid-processing-uninitalized-data-on-error.patch
and it can be found in the queue-4.8 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 5c0ba57744b1422d528f19430dd66d6803cea86f Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 25 Oct 2016 22:57:10 +0200
Subject: spi: fsl-espi: avoid processing uninitalized data on error

From: Arnd Bergmann <arnd@arndb.de>

commit 5c0ba57744b1422d528f19430dd66d6803cea86f upstream.

When we get a spurious interrupt in fsl_espi_irq, we end up
processing four uninitalized bytes of data, as shown in this
warning message:

   drivers/spi/spi-fsl-espi.c: In function 'fsl_espi_irq':
   drivers/spi/spi-fsl-espi.c:462:4: warning: 'rx_data' may be used uninitialized in this function [-Wmaybe-uninitialized]

This adds another check so we skip the data in this case.

Fixes: 6319a68011b8 ("spi/fsl-espi: avoid infinite loops on fsl_espi_cpu_irq()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/spi/spi-fsl-espi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -581,7 +581,7 @@ void fsl_espi_cpu_irq(struct mpc8xxx_spi
 
 		mspi->len -= rx_nr_bytes;
 
-		if (mspi->rx)
+		if (rx_nr_bytes && mspi->rx)
 			mspi->get_rx(rx_data, mspi);
 	}
 


Patches currently in stable-queue which might be from arnd@arndb.de are

queue-4.8/spi-fsl-espi-avoid-processing-uninitalized-data-on-error.patch