From: Xiubo Li <Li.Xiubo@freescale.com>
Date: Sun, 28 Sep 2014 09:09:54 +0000 (+0800)
Subject: regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.
X-Git-Tag: fixes-for-v3.18-merge-window~32^2~4^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d6b41cb06044a7d895db82bdd54f6e4219970510;p=pandora-kernel.git

regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.

Since we cannot make sure the 'val_count' will always be none zero
here, and then if it equals to zero, the kmemdup() will return
ZERO_SIZE_PTR, which equals to ((void *)16).

So this patch fix this with just doing the zero check before calling
kmemdup().

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
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