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[ALSA] Fix possible invalid memory access in PCM core

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snd_internval_list() may access invalid memory in the case count = 0
is given.  It shouldn't be passed, but it'd better to make the code
a bit more robust.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Takashi Iwai 2007-02-01 14:53:49 +01:00 committed by Jaroslav Kysela
parent bc7320c5c8
commit 0981a260a1
1 changed files with 5 additions and 0 deletions
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5
sound/core/pcm_lib.c
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@ -781,6 +781,11 @@ int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *
{ {
unsigned int k; unsigned int k;
int changed = 0; int changed = 0;
if (!count) {
i->empty = 1;
return -EINVAL;
}
for (k = 0; k < count; k++) { for (k = 0; k < count; k++) {
if (mask && !(mask & (1 << k))) if (mask && !(mask & (1 << k)))
continue; continue;