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@xxxxxxxxxxxxxxx> know about it.
>From 5c0ba57744b1422d528f19430dd66d6803cea86f Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@xxxxxxxx>
Date: Tue, 25 Oct 2016 22:57:10 +0200
Subject: spi: fsl-espi: avoid processing uninitalized data on error
From: Arnd Bergmann <arnd@xxxxxxxx>
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@xxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxx are
queue-4.8/spi-fsl-espi-avoid-processing-uninitalized-data-on-error.patch
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