This is a note to let you know that I've just added the patch titled
ARM: davinci: edma: fix dmaengine induced null pointer dereference on da830
to the 3.8-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:
arm-davinci-edma-fix-dmaengine-induced-null-pointer-dereference-on-da830.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 069552777a121eb39da29de4bc0383483dbe1f7e Mon Sep 17 00:00:00 2001
From: Matt Porter <mporter@xxxxxx>
Date: Tue, 5 Mar 2013 10:58:22 -0500
Subject: ARM: davinci: edma: fix dmaengine induced null pointer dereference on da830
From: Matt Porter <mporter@xxxxxx>
commit 069552777a121eb39da29de4bc0383483dbe1f7e upstream.
This adds additional error checking to the private edma api implementation
to catch the case where the edma_alloc_slot() has an invalid controller
parameter. The edma dmaengine wrapper driver relies on this condition
being handled in order to avoid setting up a second edma dmaengine
instance on DA830.
Verfied using a DA850 with the second EDMA controller platform instance
removed to simulate a DA830 which only has a single EDMA controller.
Reported-by: Tomas Novotny <tomas@xxxxxxxxxx>
Signed-off-by: Matt Porter <mporter@xxxxxx>
Tested-by: Tomas Novotny <tomas@xxxxxxxxxx>
Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-davinci/dma.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/arm/mach-davinci/dma.c
+++ b/arch/arm/mach-davinci/dma.c
@@ -743,6 +743,9 @@ EXPORT_SYMBOL(edma_free_channel);
*/
int edma_alloc_slot(unsigned ctlr, int slot)
{
+ if (!edma_cc[ctlr])
+ return -EINVAL;
+
if (slot >= 0)
slot = EDMA_CHAN_SLOT(slot);
Patches currently in stable-queue which might be from mporter@xxxxxx are
queue-3.8/arm-davinci-edma-fix-dmaengine-induced-null-pointer-dereference-on-da830.patch
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