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-rw-r--r--fs/sysfs/bin.c42
1 files changed, 31 insertions, 11 deletions
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 006fc64..66f6e58 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -61,6 +61,7 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
int size = dentry->d_inode->i_size;
loff_t offs = *off;
int count = min_t(size_t, bytes, PAGE_SIZE);
+ char *temp;
if (size) {
if (offs > size)
@@ -69,23 +70,33 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
count = size - offs;
}
+ temp = kmalloc(count, GFP_KERNEL);
+ if (!temp)
+ return -ENOMEM;
+
mutex_lock(&bb->mutex);
count = fill_read(dentry, bb->buffer, offs, count);
- if (count < 0)
- goto out_unlock;
+ if (count < 0) {
+ mutex_unlock(&bb->mutex);
+ goto out_free;
+ }
- if (copy_to_user(userbuf, bb->buffer, count)) {
+ memcpy(temp, bb->buffer, count);
+
+ mutex_unlock(&bb->mutex);
+
+ if (copy_to_user(userbuf, temp, count)) {
count = -EFAULT;
- goto out_unlock;
+ goto out_free;
}
pr_debug("offs = %lld, *off = %lld, count = %d\n", offs, *off, count);
*off = offs + count;
- out_unlock:
- mutex_unlock(&bb->mutex);
+ out_free:
+ kfree(temp);
return count;
}
@@ -118,6 +129,7 @@ static ssize_t write(struct file *file, const char __user *userbuf,
int size = dentry->d_inode->i_size;
loff_t offs = *off;
int count = min_t(size_t, bytes, PAGE_SIZE);
+ char *temp;
if (size) {
if (offs > size)
@@ -126,19 +138,27 @@ static ssize_t write(struct file *file, const char __user *userbuf,
count = size - offs;
}
- mutex_lock(&bb->mutex);
+ temp = kmalloc(count, GFP_KERNEL);
+ if (!temp)
+ return -ENOMEM;
- if (copy_from_user(bb->buffer, userbuf, count)) {
+ if (copy_from_user(temp, userbuf, count)) {
count = -EFAULT;
- goto out_unlock;
+ goto out_free;
}
+ mutex_lock(&bb->mutex);
+
+ memcpy(bb->buffer, temp, count);
+
count = flush_write(dentry, bb->buffer, offs, count);
+ mutex_unlock(&bb->mutex);
+
if (count > 0)
*off = offs + count;
- out_unlock:
- mutex_unlock(&bb->mutex);
+out_free:
+ kfree(temp);
return count;
}