This is a note to let you know that I've just added the patch titled
regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.
to the 3.17-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:
regmap-fix-possible-zero_size_ptr-pointer-dereferencing-error.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d6b41cb06044a7d895db82bdd54f6e4219970510 Mon Sep 17 00:00:00 2001
From: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
Date: Sun, 28 Sep 2014 17:09:54 +0800
Subject: regmap: fix possible ZERO_SIZE_PTR pointer dereferencing error.
From: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
commit d6b41cb06044a7d895db82bdd54f6e4219970510 upstream.
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@xxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/regmap/regmap.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1659,6 +1659,9 @@ out:
} else {
void *wval;
+ if (!val_count)
+ return -EINVAL;
+
wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
if (!wval) {
dev_err(map->dev, "Error in memory allocation\n");
Patches currently in stable-queue which might be from Li.Xiubo@xxxxxxxxxxxxx are
queue-3.17/regmap-fix-possible-zero_size_ptr-pointer-dereferencing-error.patch
queue-3.17/regmap-debugfs-fix-possbile-null-pointer-dereference.patch
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