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authorJonathan Corbet <corbet@lwn.net>2009-08-06 13:35:44 -0600
committerThomas Gleixner <tglx@linutronix.de>2009-10-14 15:31:10 +0200
commit1a6deaea3584fd7af1cad492b1fe0867060b45db (patch)
tree83e6f420efe2622c76fba4becd74dd9087cccf59 /kernel/pm_qos_params.c
parente6fe07a014c7a3466dcd1a387a9ac04d84c2703c (diff)
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pm_qos: clean up racy global "name" variable
"name" is a poor name for a file-global variable. It was used in three different functions, with no mutual exclusion. But it's just a tiny, temporary string; let's just move it onto the stack in the functions that need it. Also use snprintf() just in case. Signed-off-by: Jonathan Corbet <corbet@lwn.net> LKML-Reference: <20091010153349.113570550@linutronix.de> Acked-by: Mark Gross <mgross@linux.intel.com> Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/pm_qos_params.c')
-rw-r--r--kernel/pm_qos_params.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index d96b83ed21cb..3db49b9ca374 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -343,18 +343,18 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
}
EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
-#define PID_NAME_LEN sizeof("process_1234567890")
-static char name[PID_NAME_LEN];
+#define PID_NAME_LEN 32
static int pm_qos_power_open(struct inode *inode, struct file *filp)
{
int ret;
long pm_qos_class;
+ char name[PID_NAME_LEN];
pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
if (pm_qos_class >= 0) {
filp->private_data = (void *)pm_qos_class;
- sprintf(name, "process_%d", current->pid);
+ snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
ret = pm_qos_add_requirement(pm_qos_class, name,
PM_QOS_DEFAULT_VALUE);
if (ret >= 0)
@@ -366,9 +366,10 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
static int pm_qos_power_release(struct inode *inode, struct file *filp)
{
int pm_qos_class;
+ char name[PID_NAME_LEN];
pm_qos_class = (long)filp->private_data;
- sprintf(name, "process_%d", current->pid);
+ snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
pm_qos_remove_requirement(pm_qos_class, name);
return 0;
@@ -379,13 +380,14 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
{
s32 value;
int pm_qos_class;
+ char name[PID_NAME_LEN];
pm_qos_class = (long)filp->private_data;
if (count != sizeof(s32))
return -EINVAL;
if (copy_from_user(&value, buf, sizeof(s32)))
return -EFAULT;
- sprintf(name, "process_%d", current->pid);
+ snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
pm_qos_update_requirement(pm_qos_class, name, value);
return sizeof(s32);