linux-kernel - [PATCH] regmap: cache: bail in regmap_async

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Message-Id: <1372936263-14472-1-git-send-email-zonque@gmail.com>
Date:	Thu,  4 Jul 2013 13:11:03 +0200
From:	Daniel Mack <zonque@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	broonie@...nel.org, Daniel Mack <zonque@...il.com>,
	stable@...r.kernel.org, "[v3.10 only]"@mail.zonque.de
Subject: [PATCH] regmap: cache: bail in regmap_async_complete() for bus-less maps

Commit f8bd822cb ("regmap: cache: Factor out block sync") made
regcache_rbtree_sync() call regmap_async_complete(), which in turn does
not check for map->bus before dereferencing it.

This causes a NULL pointer dereference on bus-less maps.

Signed-off-by: Daniel Mack <zonque@...il.com>
Cc: stable@...r.kernel.org [v3.10 only]
---
 drivers/base/regmap/regmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index a941dcf..d0c81d1 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1717,7 +1717,7 @@ int regmap_async_complete(struct regmap *map)
 	int ret;
 
 	/* Nothing to do with no async support */
-	if (!map->bus->async_write)
+	if (!map->bus || !map->bus->async_write)
 		return 0;
 
 	trace_regmap_async_complete_start(map->dev);
-- 
1.8.1.4

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