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Message-Id: <20241129-topic-opp-fix-assert-index-check-v2-1-386b2dcbb9a6@linaro.org>
Date: Fri, 29 Nov 2024 16:06:24 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
Stephen Boyd <sboyd@...nel.org>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v2 1/2] OPP: add index check to assert to avoid buffer
overflow in _read_freq()
Pass the freq index to the assert function to make sure
we do not read a freq out of the opp->rates[] table when called
from the indexed variants:
dev_pm_opp_find_freq_exact_indexed() or
dev_pm_opp_find_freq_ceil/floor_indexed().
Add a secondary parameter to the assert function, unused
for assert_single_clk() then add assert_clk_index() which
will check for the clock index when called from the _indexed()
find functions.
Fixes: 142e17c1c2b4 ("OPP: Introduce dev_pm_opp_find_freq_{ceil/floor}_indexed() APIs")
Fixes: a5893928bb17 ("OPP: Add dev_pm_opp_find_freq_exact_indexed()")
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
drivers/opp/core.c | 40 +++++++++++++++++++++++++---------------
1 file changed, 25 insertions(+), 15 deletions(-)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index d4a0030a0228d6282d672e3ffe3aeea27e80822a..52c6a45ceb7479c3ef0ed97ab43a37546d695c7f 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -101,11 +101,19 @@ struct opp_table *_find_opp_table(struct device *dev)
* representation in the OPP table and manage the clock configuration themselves
* in an platform specific way.
*/
-static bool assert_single_clk(struct opp_table *opp_table)
+static bool assert_single_clk(struct opp_table *opp_table, int __always_unused index)
{
return !WARN_ON(opp_table->clk_count > 1);
}
+/*
+ * Returns true if clock table is large enough to contain the clock index.
+ */
+static bool assert_clk_index(struct opp_table *opp_table, int index)
+{
+ return opp_table->clk_count > index;
+}
+
/**
* dev_pm_opp_get_bw() - Gets the bandwidth corresponding to an opp
* @opp: opp for which bandwidth has to be returned for
@@ -524,12 +532,12 @@ static struct dev_pm_opp *_opp_table_find_key(struct opp_table *opp_table,
unsigned long (*read)(struct dev_pm_opp *opp, int index),
bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
unsigned long opp_key, unsigned long key),
- bool (*assert)(struct opp_table *opp_table))
+ bool (*assert)(struct opp_table *opp_table, int index))
{
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
/* Assert that the requirement is met */
- if (assert && !assert(opp_table))
+ if (assert && !assert(opp_table, index))
return ERR_PTR(-EINVAL);
mutex_lock(&opp_table->lock);
@@ -557,7 +565,7 @@ _find_key(struct device *dev, unsigned long *key, int index, bool available,
unsigned long (*read)(struct dev_pm_opp *opp, int index),
bool (*compare)(struct dev_pm_opp **opp, struct dev_pm_opp *temp_opp,
unsigned long opp_key, unsigned long key),
- bool (*assert)(struct opp_table *opp_table))
+ bool (*assert)(struct opp_table *opp_table, int index))
{
struct opp_table *opp_table;
struct dev_pm_opp *opp;
@@ -580,7 +588,7 @@ _find_key(struct device *dev, unsigned long *key, int index, bool available,
static struct dev_pm_opp *_find_key_exact(struct device *dev,
unsigned long key, int index, bool available,
unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
+ bool (*assert)(struct opp_table *opp_table, int index))
{
/*
* The value of key will be updated here, but will be ignored as the
@@ -593,7 +601,7 @@ static struct dev_pm_opp *_find_key_exact(struct device *dev,
static struct dev_pm_opp *_opp_table_find_key_ceil(struct opp_table *opp_table,
unsigned long *key, int index, bool available,
unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
+ bool (*assert)(struct opp_table *opp_table, int index))
{
return _opp_table_find_key(opp_table, key, index, available, read,
_compare_ceil, assert);
@@ -602,7 +610,7 @@ static struct dev_pm_opp *_opp_table_find_key_ceil(struct opp_table *opp_table,
static struct dev_pm_opp *_find_key_ceil(struct device *dev, unsigned long *key,
int index, bool available,
unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
+ bool (*assert)(struct opp_table *opp_table, int index))
{
return _find_key(dev, key, index, available, read, _compare_ceil,
assert);
@@ -611,7 +619,7 @@ static struct dev_pm_opp *_find_key_ceil(struct device *dev, unsigned long *key,
static struct dev_pm_opp *_find_key_floor(struct device *dev,
unsigned long *key, int index, bool available,
unsigned long (*read)(struct dev_pm_opp *opp, int index),
- bool (*assert)(struct opp_table *opp_table))
+ bool (*assert)(struct opp_table *opp_table, int index))
{
return _find_key(dev, key, index, available, read, _compare_floor,
assert);
@@ -672,7 +680,8 @@ struct dev_pm_opp *
dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
u32 index, bool available)
{
- return _find_key_exact(dev, freq, index, available, _read_freq, NULL);
+ return _find_key_exact(dev, freq, index, available, _read_freq,
+ assert_clk_index);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact_indexed);
@@ -732,7 +741,8 @@ struct dev_pm_opp *
dev_pm_opp_find_freq_ceil_indexed(struct device *dev, unsigned long *freq,
u32 index)
{
- return _find_key_ceil(dev, freq, index, true, _read_freq, NULL);
+ return _find_key_ceil(dev, freq, index, true, _read_freq,
+ assert_clk_index);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_indexed);
@@ -785,7 +795,7 @@ struct dev_pm_opp *
dev_pm_opp_find_freq_floor_indexed(struct device *dev, unsigned long *freq,
u32 index)
{
- return _find_key_floor(dev, freq, index, true, _read_freq, NULL);
+ return _find_key_floor(dev, freq, index, true, _read_freq, assert_clk_index);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor_indexed);
@@ -1727,7 +1737,7 @@ void dev_pm_opp_remove(struct device *dev, unsigned long freq)
if (IS_ERR(opp_table))
return;
- if (!assert_single_clk(opp_table))
+ if (!assert_single_clk(opp_table, 0))
goto put_table;
mutex_lock(&opp_table->lock);
@@ -2079,7 +2089,7 @@ int _opp_add_v1(struct opp_table *opp_table, struct device *dev,
unsigned long tol, u_volt = data->u_volt;
int ret;
- if (!assert_single_clk(opp_table))
+ if (!assert_single_clk(opp_table, 0))
return -EINVAL;
new_opp = _opp_allocate(opp_table);
@@ -2835,7 +2845,7 @@ static int _opp_set_availability(struct device *dev, unsigned long freq,
return r;
}
- if (!assert_single_clk(opp_table)) {
+ if (!assert_single_clk(opp_table, 0)) {
r = -EINVAL;
goto put_table;
}
@@ -2911,7 +2921,7 @@ int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq,
return r;
}
- if (!assert_single_clk(opp_table)) {
+ if (!assert_single_clk(opp_table, 0)) {
r = -EINVAL;
goto put_table;
}
--
2.34.1
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