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Commit 4503efd0 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

sysfs: fix problems with binary files 



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: default avatarPavel Roskin <proski@gnu.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 72638f59

fs/sysfs/bin.c

+6 −0
Original line number Diff line number Diff line
@@ -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);

	char *temp;



	if (!bytes)

		return 0;



	if (size) {

		if (offs > size)

			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);

	char *temp;



	if (!bytes)

		return 0;



	if (size) {

		if (offs > size)

			return 0;