[PATCH] PM / clock_ops: Fix clock error check in __pm_clk_add()

From: Geert Uytterhoeven
Date: Fri May 08 2015 - 04:47:52 EST

In the final iteration of commit 245bd6f6af8a62a2 ("PM / clock_ops: Add
pm_clk_add_clk()"), a refcount increment was added by Grygorii Strashko.
However, the accompanying IS_ERR() check operates on the wrong clock
pointer, which is always zero at this point, i.e. not an error.
This may lead to a NULL pointer dereference later, when __clk_get()
tries to dereference an error pointer.

Check the passed clock pointer instead to fix this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Fixes: 245bd6f6af8a62a2 ("PM / clock_ops: Add pm_clk_add_clk()")
Note that there are no users of pm_clk_add_clk() in next-20150508, so
for now no in-tree code is affected.
drivers/base/power/clock_ops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
index 7fdd0172605afe1b..c7b0fcebf168cabe 100644
--- a/drivers/base/power/clock_ops.c
+++ b/drivers/base/power/clock_ops.c
@@ -93,7 +93,7 @@ static int __pm_clk_add(struct device *dev, const char *con_id,
return -ENOMEM;
} else {
- if (IS_ERR(ce->clk) || !__clk_get(clk)) {
+ if (IS_ERR(clk) || !__clk_get(clk)) {
return -ENOENT;

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