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sound: avoid endless loop

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'sound play 1 100000' results in an endless loop on the sandbox.

If the frequency exceeds half the sampling rate, zero out the output
buffer.

Fixes: 511ed5fdd3 ("SOUND: SAMSUNG: Add I2S driver")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Heinrich Schuchardt 2022-12-04 14:00:05 +01:00
parent a50622d78c
commit d0e8777bee
1 changed files with 4 additions and 1 deletions
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5
drivers/sound/sound.c
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@ -15,7 +15,10 @@ void sound_create_square_wave(uint sample_rate, unsigned short *data, int size,
const int period = freq ? sample_rate / freq : 0;
const int half = period / 2;
assert(freq);
if (!half) {
memset(data, 0, size);
return;
}
/* Make sure we don't overflow our buffer */
if (size % 2)