The patch below does not apply to the 3.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 4e67fb5f5e336250db944921e3c68057d6203034 Mon Sep 17 00:00:00 2001
From: David Jander <david@xxxxxxxxxxx>
Date: Wed, 21 Aug 2013 17:37:22 +0200
Subject: [PATCH] regmap: rbtree: Fix overlapping rbnodes.
Avoid overlapping register regions by making the initial blklen of a new
node 1. If a register write occurs to a yet uncached register, that is
lower than but near an existing node's base_reg, a new node is created
and it's blklen is set to an arbitrary value (sizeof(*rbnode)). That may
cause this node to overlap with another node. Those nodes should be merged,
but this merge doesn't happen yet, so this patch at least makes the initial
blklen small enough to avoid hitting the wrong node, which may otherwise
lead to severe breakage.
Signed-off-by: David Jander <david@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 5c1435c..0fccc99 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -332,7 +332,7 @@ regcache_rbtree_node_alloc(struct regmap *map, unsigned int reg)
}
if (!rbnode->blklen) {
- rbnode->blklen = sizeof(*rbnode);
+ rbnode->blklen = 1;
rbnode->base_reg = reg;
}
--
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