This is a note to let you know that I've just added the patch titled
OPP: add index check to assert to avoid buffer overflow in _read_freq()
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
opp-add-index-check-to-assert-to-avoid-buffer-overfl.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1176e4c27d07c095e4c386525630eab34d8a2dd6
Author: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
Date: Tue Dec 3 09:12:59 2024 +0100
OPP: add index check to assert to avoid buffer overflow in _read_freq()
[ Upstream commit d659bc68ed489022ea33342cfbda2911a81e7a0d ]
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@xxxxxxxxxx>
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 3aa18737470fa..1efb819c91b63 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -101,11 +101,21 @@ 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,
+ unsigned 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,
+ unsigned int index)
+{
+ return opp_table->clk_count > index;
+}
+
/**
* dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp
* @opp: opp for which voltage has to be returned for
@@ -499,12 +509,12 @@ 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, unsigned 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);
@@ -532,7 +542,7 @@ _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, unsigned int index))
{
struct opp_table *opp_table;
struct dev_pm_opp *opp;
@@ -555,7 +565,7 @@ _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, unsigned int index))
{
/*
* The value of key will be updated here, but will be ignored as the
@@ -568,7 +578,7 @@ 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, unsigned int index))
{
return _opp_table_find_key(opp_table, key, index, available, read,
_compare_ceil, assert);
@@ -577,7 +587,7 @@ 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, unsigned int index))
{
return _find_key(dev, key, index, available, read, _compare_ceil,
assert);
@@ -586,7 +596,7 @@ 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, unsigned int index))
{
return _find_key(dev, key, index, available, read, _compare_floor,
assert);
@@ -647,7 +657,8 @@ 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);
@@ -707,7 +718,8 @@ 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);
@@ -760,7 +772,7 @@ 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);
@@ -1702,7 +1714,7 @@ 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);
@@ -2054,7 +2066,7 @@ 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);
@@ -2911,7 +2923,7 @@ 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;
}
@@ -2987,7 +2999,7 @@ 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;
}
