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iio: dac: ad3552r-hs: fix uninitialized data ni ad3552r_hs_write_data_source()

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If the *ppos value is non-zero then the simple_write_to_buffer() function
won't initialized the start of the buf[] buffer.  Non-zero values for
*ppos won't work here generally, so just test for them and return -ENOSPC
at the start of the function.

Fixes: b1c5d68ea6 ("iio: dac: ad3552r-hs: add support for internal ramp")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Angelo Dureghello <adureghello@baylibre.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Dan Carpenter
2026-05-25 10:15:46 +03:00
committed by Jonathan Cameron
parent 929fec2964
commit eaaa7eef18
1 changed files with 1 additions and 1 deletions
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drivers/iio/dac/ad3552r-hs.c
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@@ -549,7 +549,7 @@ static ssize_t ad3552r_hs_write_data_source(struct file *f,
guard(mutex)(&st->lock);
if (count >= sizeof(buf))
if (*ppos != 0 || count >= sizeof(buf))
return -ENOSPC;
ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf,