[PATCH 2/2] regmap: Do not call regcache_exit from regcache_lzo_init error path

[Lars-Peter Clausen]

Calling regcache_exit from regcache_lzo_init is first of all a layering
violation and secondly will cause double frees. regcache_exit will free buffers
allocated by the core, but the core will also free the same buffers when the
cacheops init callback returns an error. Thus we end up with a double free.
Fix this by not calling regcache_exit but only free those buffers which, have
been allocated in this function.

Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Acked-by: Dimitris Papastamos <dp@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
 drivers/base/regmap/regcache-lzo.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c
index 226ffc1..b7d1614 100644
--- a/drivers/base/regmap/regcache-lzo.c
+++ b/drivers/base/regmap/regcache-lzo.c
@@ -15,6 +15,8 @@
 
 #include "internal.h"
 
+static int regcache_lzo_exit(struct regmap *map);
+
 struct regcache_lzo_ctx {
 	void *wmem;
 	void *dst;
@@ -193,7 +195,7 @@ static int regcache_lzo_init(struct regmap *map)
 
 	return 0;
 err:
-	regcache_exit(map);
+	regcache_lzo_exit(map);
 	return ret;
 }
 
-- 
1.7.7.1


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