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iio: core: fix uninitialized data in debugfs

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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.

Fixes: 6d5dd486c7 ("iio: core: make use of simple_write_to_buffer()")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Maxwell Doose <m32285159@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 10:16:27 +03:00 committed by Jonathan Cameron
parent a6e8b14a48
commit ab92ed206d
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/industrialio-core.c
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@ -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,