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sysfs: fix error handling in binattr write() 

Error handling in fs/sysfs/bin.c:write() was wrong because size_t
count is used to receive return value from flush_write() which is
negative on failure.

This patch updates write() such that int variable is used instead.
read() is updated the same way for consistency.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Tejun Heo 2007-06-14 03:45:13 +09:00 committed by Greg Kroah-Hartman
parent 7a23ad4404
commit 93e3cd8270
1 changed files with 9 additions and 14 deletions
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23
fs/sysfs/bin.c
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@ -33,16 +33,13 @@ fill_read(struct dentry *dentry, char *buffer, loff_t off, size_t count)
}
static ssize_t
read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
{
char *buffer = file->private_data;
struct dentry *dentry = file->f_path.dentry;
int size = dentry->d_inode->i_size;
loff_t offs = *off;
int ret;
if (count > PAGE_SIZE)
count = PAGE_SIZE;
int count = min_t(size_t, bytes, PAGE_SIZE);
if (size) {
if (offs > size)
@ -51,15 +48,14 @@ read(struct file * file, char __user * userbuf, size_t count, loff_t * off)
count = size - offs;
}
ret = fill_read(dentry, buffer, offs, count);
if (ret < 0)
return ret;
count = ret;
count = fill_read(dentry, buffer, offs, count);
if (count < 0)
return count;
if (copy_to_user(userbuf, buffer, count))
return -EFAULT;
pr_debug("offs = %lld, *off = %lld, count = %zd\n", offs, *off, count);
pr_debug("offs = %lld, *off = %lld, count = %d\n", offs, *off, count);
*off = offs + count;
@ -78,16 +74,15 @@ flush_write(struct dentry *dentry, char *buffer, loff_t offset, size_t count)
return attr->write(kobj, buffer, offset, count);
}
static ssize_t write(struct file * file, const char __user * userbuf,
size_t count, loff_t * off)
static ssize_t write(struct file *file, const char __user *userbuf,
size_t bytes, loff_t *off)
{
char *buffer = file->private_data;
struct dentry *dentry = file->f_path.dentry;
int size = dentry->d_inode->i_size;
loff_t offs = *off;
int count = min_t(size_t, bytes, PAGE_SIZE);
if (count > PAGE_SIZE)
count = PAGE_SIZE;
if (size) {
if (offs > size)
return 0;