From: Viresh Kumar <viresh.kumar@...>

commit 5ff24d601092b222340b28466e263b1c4559407e upstream.

sprintf() can access memory outside of the range of the character array,
and is risky in some situations. The driver specified prop_name string
can be longer than NAME_MAX here (only an attacker will do that though)
and so blindly copying it into the character array of size NAME_MAX
isn't safe. Instead we must use snprintf() here.

Reported-by: Geert Uytterhoeven <geert@...>
Signed-off-by: Viresh Kumar <viresh.kumar@...>
Acked-by: Geert Uytterhoeven <geert+renesas@...>
Acked-by: Stephen Boyd <sboyd@...>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...>
Signed-off-by: Chen-Yu Tsai (Moxa) <wens@...>
---
drivers/base/power/opp/core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.=
c
index 504a6d4e46723..1e0a2ddf73323 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -808,7 +808,8 @@ static int opp_parse_supplies(struct dev_pm_opp *opp,=
struct device *dev,
=20
/* Search for "opp-microvolt-<name>" */
if (dev_opp->prop_name) {
- sprintf(name, "opp-microvolt-%s", dev_opp->prop_name);
+ snprintf(name, sizeof(name), "opp-microvolt-%s",
+ dev_opp->prop_name);
prop =3D of_find_property(opp->np, name, NULL);
}
=20
@@ -855,7 +856,8 @@ static int opp_parse_supplies(struct dev_pm_opp *opp,=
struct device *dev,
/* Search for "opp-microamp-<name>" */
prop =3D NULL;
if (dev_opp->prop_name) {
- sprintf(name, "opp-microamp-%s", dev_opp->prop_name);
+ snprintf(name, sizeof(name), "opp-microamp-%s",
+ dev_opp->prop_name);
prop =3D of_find_property(opp->np, name, NULL);
}
=20
--=20
2.27.0.rc0