From: Linus Walleij <linus.walleij@linaro.org>
Date: Thu, 13 Feb 2014 09:39:01 +0000 (+0100)
Subject: dma: ste_dma40: don't dereference free:d descriptor
X-Git-Tag: v3.2.56~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=74f925dea76124060a2021460a26c6ddc815bfff;p=pandora-kernel.git

dma: ste_dma40: don't dereference free:d descriptor

commit e9baa9d9d520fb0e24cca671e430689de2d4a4b2 upstream.

It appears that in the DMA40 driver the DMA tasklet will very
often dereference memory for a descriptor just free:d from the
DMA40 slab. Nothing happens because no other part of the driver
has yet had a chance to claim this memory, but it's really
nasty to dereference free:d memory, so let's check the flag
before the descriptor is free and store it in a bool variable.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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