From: Dan Carpenter dan.carpenter@linaro.org

stable inclusion from stable-v5.10.201 commit 3f795fb35c2d8a637efe76b4518216c9319b998c category: bugfix bugzilla: 189268

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit c99626092efca3061b387043d4a7399bf75fbdd5 ]

The dev->id value comes from ida_alloc() so it's a number between zero and INT_MAX. If it's too high then these sprintf()s will overflow.

Fixes: 203d3d4aa482 ("the generic thermal sysfs driver") Signed-off-by: Dan Carpenter dan.carpenter@linaro.org Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Ridong chenridong@huawei.com --- drivers/thermal/thermal_core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 7b0ffc1c0ea9..98d9bba6f4ac 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -733,7 +733,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, if (result) goto release_ida;

- sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); + snprintf(dev->attr_name, sizeof(dev->attr_name), "cdev%d_trip_point", + dev->id); sysfs_attr_init(&dev->attr.attr); dev->attr.attr.name = dev->attr_name; dev->attr.attr.mode = 0444; @@ -742,7 +743,8 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, if (result) goto remove_symbol_link;

- sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id); + snprintf(dev->weight_attr_name, sizeof(dev->weight_attr_name), + "cdev%d_weight", dev->id); sysfs_attr_init(&dev->weight_attr.attr); dev->weight_attr.attr.name = dev->weight_attr_name; dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;