[PATCH 6/8] sound: Fix buffer overflow in square wave generation

[Simon Glass]

On Sun, 3 Apr 2022 at 04:39, Andrew Scull <ascull at google.com> wrote:
>
> Data is written for each channel but is only tracked as having one
> channel written. This resulted in a buffer overflow and corruption of
> the allocator's metadata which caused further problems when the buffer
> was later freed. This could be observed with sandbox unit tests.
>
> Resolve the overflow by tracking the writes for each channel.
>
> Fixes: f987177db9 ("dm: sound: Use the correct number of channels for sound")
> Signed-off-by: Andrew Scull <ascull at google.com>
> Cc: Simon Glass <sjg at chromium.org>
> ---
>  drivers/sound/sound.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)

Reviewed-by: Simon Glass <sjg at chromium.org>