patch "iio: core: fix uninitialized data in debugfs" added to char-misc-next

This is a note to let you know that I've just added the patch titled

iio: core: fix uninitialized data in debugfs

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-next branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will also be merged in the next major kernel release during the merge window.

If you have any questions about this process, please let me know.

From ab92ed206d41fd171ebd37bc46360d9f2140d043 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <[email protected]>
Date: Mon, 25 May 2026 10:16:27 +0300
Subject: iio: core: fix uninitialized data in debugfs

If *ppos is non-zero then simple_write_to_buffer() will not initialize the start of buf[]. Non zero values for *ppos aren't going to work anyway. Test for them at the start of the function and return -EINVAL.

---
 drivers/iio/industrialio-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 22eefd048ba9..15b56f8972fc 100644
@@ -418,7 +418,7 @@ static ssize_t iio_debugfs_write_reg(struct file *file,
 	char buf[80];
 	int ret;
 
-	if (count >= sizeof(buf))
+	if (*ppos != 0 || count >= sizeof(buf))
 		return -EINVAL;
 
 	ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf,

2.54.0