5.4-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@linaro.org
[ 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 --- 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 f4490b8120176..450a1eb90af52 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -740,7 +740,8 @@ 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; @@ -749,7 +750,8 @@ 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;