From 07e5e811f86dcd6f595c3bbd71cde294e8545889 Mon Sep 17 00:00:00 2001 From: Sumeet Pawnikar Date: Sun, 11 Jan 2026 19:42:36 +0530 Subject: [PATCH] powercap: Replace sprintf() with sysfs_emit() in sysfs show functions Replace all sprintf() calls with sysfs_emit() in sysfs show functions. sysfs_emit() is preferred over sprintf() for formatting sysfs output as it provides better bounds checking and prevents potential buffer overflows. Also, replace sprintf() with sysfs_emit() in show_constraint_name() and simplify the code by removing the redundant strlen() call since sysfs_emit() returns the length. Signed-off-by: Sumeet Pawnikar Link: https://patch.msgid.link/20260111141237.12340-1-sumeet4linux@gmail.com Signed-off-by: Rafael J. Wysocki --- drivers/powercap/powercap_sys.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/drivers/powercap/powercap_sys.c b/drivers/powercap/powercap_sys.c index 1ff369880beb2..f3b2ae635305d 100644 --- a/drivers/powercap/powercap_sys.c +++ b/drivers/powercap/powercap_sys.c @@ -27,7 +27,7 @@ static ssize_t _attr##_show(struct device *dev, \ \ if (power_zone->ops->get_##_attr) { \ if (!power_zone->ops->get_##_attr(power_zone, &value)) \ - len = sprintf(buf, "%lld\n", value); \ + len = sysfs_emit(buf, "%lld\n", value); \ } \ \ return len; \ @@ -75,7 +75,7 @@ static ssize_t show_constraint_##_attr(struct device *dev, \ pconst = &power_zone->constraints[id]; \ if (pconst && pconst->ops && pconst->ops->get_##_attr) { \ if (!pconst->ops->get_##_attr(power_zone, id, &value)) \ - len = sprintf(buf, "%lld\n", value); \ + len = sysfs_emit(buf, "%lld\n", value); \ } \ \ return len; \ @@ -171,9 +171,8 @@ static ssize_t show_constraint_name(struct device *dev, if (pconst && pconst->ops && pconst->ops->get_name) { name = pconst->ops->get_name(power_zone, id); if (name) { - sprintf(buf, "%.*s\n", POWERCAP_CONSTRAINT_NAME_LEN - 1, - name); - len = strlen(buf); + len = sysfs_emit(buf, "%.*s\n", + POWERCAP_CONSTRAINT_NAME_LEN - 1, name); } } @@ -350,7 +349,7 @@ static ssize_t name_show(struct device *dev, { struct powercap_zone *power_zone = to_powercap_zone(dev); - return sprintf(buf, "%s\n", power_zone->name); + return sysfs_emit(buf, "%s\n", power_zone->name); } static DEVICE_ATTR_RO(name); @@ -438,7 +437,7 @@ static ssize_t enabled_show(struct device *dev, mode = false; } - return sprintf(buf, "%d\n", mode); + return sysfs_emit(buf, "%d\n", mode); } static ssize_t enabled_store(struct device *dev, -- 2.47.3