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authorBoris Brezillon <boris.brezillon@free-electrons.com>2015-03-29 03:48:48 +0200
committerMichael Turquette <mturquette@linaro.org>2015-04-12 21:09:49 -0700
commit03bc10ab5b0f9b8f81bffbe6e40c944f9d3dbcc5 (patch)
treec4d41d3a87567ebbe374db36b156621a7e6f6d55
parent4591243102faa8de92da320edea47219901461e9 (diff)
clk: check ->determine/round_rate() return value in clk_calc_new_rates
->determine_rate() and ->round_rate() can return the closest rate to the requested one or an error code. clk_calc_new_rates is assuming these functions can't return a negative value, which leads to a undefined behavior when the clk implementation returns such an error code. Fix this by returning NULL in case ->determine_rate() or ->round_rate() returned an error code. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Michael Turquette <mturquette@linaro.org>
-rw-r--r--drivers/clk/clk.c23
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index fa5a00e5ee41..459ce9da13e0 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1618,6 +1618,7 @@ static struct clk_core *clk_calc_new_rates(struct clk_core *clk,
unsigned long min_rate;
unsigned long max_rate;
int p_index = 0;
+ long ret;
/* sanity */
if (IS_ERR_OR_NULL(clk))
@@ -1633,15 +1634,23 @@ static struct clk_core *clk_calc_new_rates(struct clk_core *clk,
/* find the closest rate and parent clk/rate */
if (clk->ops->determine_rate) {
parent_hw = parent ? parent->hw : NULL;
- new_rate = clk->ops->determine_rate(clk->hw, rate,
- min_rate,
- max_rate,
- &best_parent_rate,
- &parent_hw);
+ ret = clk->ops->determine_rate(clk->hw, rate,
+ min_rate,
+ max_rate,
+ &best_parent_rate,
+ &parent_hw);
+ if (ret < 0)
+ return NULL;
+
+ new_rate = ret;
parent = parent_hw ? parent_hw->core : NULL;
} else if (clk->ops->round_rate) {
- new_rate = clk->ops->round_rate(clk->hw, rate,
- &best_parent_rate);
+ ret = clk->ops->round_rate(clk->hw, rate,
+ &best_parent_rate);
+ if (ret < 0)
+ return NULL;
+
+ new_rate = ret;
if (new_rate < min_rate || new_rate > max_rate)
return NULL;
} else if (!parent || !(clk->flags & CLK_SET_RATE_PARENT)) {

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