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iio: backend: fix uninitialized data in debugfs

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If the *ppos value is non-zero then simple_write_to_buffer() will not
initialize the start of the buf[] buffer.  Non-zero ppos values aren't
going to work at all.  Check for that at the start of the function and
return -ENOSPC.

Fixes: cdf01e0809 ("iio: backend: add debugFs interface")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Dan Carpenter 2026-05-25 10:16:11 +03:00 committed by Jonathan Cameron
parent eaaa7eef18
commit a6e8b14a48
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/industrialio-backend.c
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@ -156,7 +156,7 @@ static ssize_t iio_backend_debugfs_write_reg(struct file *file,
ssize_t rc;
int ret;
if (count >= sizeof(buf))
if (*ppos != 0 || count >= sizeof(buf))
return -ENOSPC;
rc = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, count);