This is a note to let you know that I've just added the patch titled
spi: dw-mid: avoid potential NULL dereference
to the 3.19-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-dw-mid-avoid-potential-null-dereference.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c9dafb27c84412fe4b17c3b94cc4ffeef5df1833 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Date: Mon, 2 Mar 2015 20:15:58 +0200
Subject: spi: dw-mid: avoid potential NULL dereference
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
commit c9dafb27c84412fe4b17c3b94cc4ffeef5df1833 upstream.
When DMA descriptor allocation fails we should not try to assign any fields in
the bad descriptor. The patch adds the necessary checks for that.
Fixes: 7063c0d942a1 (spi/dw_spi: add DMA support)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-dw-mid.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/spi/spi-dw-mid.c
+++ b/drivers/spi/spi-dw-mid.c
@@ -139,6 +139,9 @@ static struct dma_async_tx_descriptor *d
1,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!txdesc)
+ return NULL;
+
txdesc->callback = dw_spi_dma_tx_done;
txdesc->callback_param = dws;
@@ -184,6 +187,9 @@ static struct dma_async_tx_descriptor *d
1,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (!rxdesc)
+ return NULL;
+
rxdesc->callback = dw_spi_dma_rx_done;
rxdesc->callback_param = dws;
Patches currently in stable-queue which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are
queue-3.19/spi-dw-mid-avoid-potential-null-dereference.patch
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