Commit 6217e5ed authored by Dan Carpenter's avatar Dan Carpenter Committed by Takashi Iwai

ALSA: compress: fix an integer overflow check

I previously added an integer overflow check here but looking at it now,
it's still buggy.

The bug happens in snd_compr_allocate_buffer().  We multiply
".fragments" and ".fragment_size" and that doesn't overflow but then we
save it in an unsigned int so it truncates the high bits away and we
allocate a smaller than expected size.

Fixes: b35cc822 ('ALSA: compress_core: integer overflow in snd_compr_allocate_buffer()')
Signed-off-by: default avatarDan Carpenter <>
Signed-off-by: default avatarTakashi Iwai <>
parent 892028ac
......@@ -491,7 +491,7 @@ static int snd_compress_check_input(struct snd_compr_params *params)
/* first let's check the buffer parameter's */
if (params->buffer.fragment_size == 0 ||
params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
params->buffer.fragments > INT_MAX / params->buffer.fragment_size)
return -EINVAL;
/* now codec parameters */
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