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sysfs: fix problems with binary files

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Some sysfs binary files don't like having 0 passed to them as a size.
Fix this up at the root by just returning to the vfs if userspace asks
us for a zero sized buffer.

Thanks to Pavel Roskin for pointing this out.

Reported-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2009-01-20 15:51:16 -08:00
parent 72638f598e
commit 4503efd089
1 changed files with 6 additions and 0 deletions
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6
fs/sysfs/bin.c
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@ -63,6 +63,9 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
int count = min_t(size_t, bytes, PAGE_SIZE); int count = min_t(size_t, bytes, PAGE_SIZE);
char *temp; char *temp;
if (!bytes)
return 0;
if (size) { if (size) {
if (offs > size) if (offs > size)
return 0; return 0;
@ -131,6 +134,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
int count = min_t(size_t, bytes, PAGE_SIZE); int count = min_t(size_t, bytes, PAGE_SIZE);
char *temp; char *temp;
if (!bytes)
return 0;
if (size) { if (size) {
if (offs > size) if (offs > size)
return 0; return 0;