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pcm: direct plugins - fix bad memory access when channel bindings do not match hw

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Fix and cleanup snd_pcm_direct_check_interleave() function.
Add requested / hardware channel check and use goto when the interleaved

Fixes: https://github.com/alsa-project/alsa-lib/issues/117
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-06-21 15:14:18 +02:00
parent a5e11f9a81
commit e0e0846590
1 changed files with 17 additions and 23 deletions
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40
src/pcm/pcm_direct.c
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@ -1627,43 +1627,37 @@ int snd_pcm_direct_set_timer_params(snd_pcm_direct_t *dmix)
int snd_pcm_direct_check_interleave(snd_pcm_direct_t *dmix, snd_pcm_t *pcm) int snd_pcm_direct_check_interleave(snd_pcm_direct_t *dmix, snd_pcm_t *pcm)
{ {
unsigned int chn, channels; unsigned int chn, channels;
int bits, interleaved = 1; int bits;
const snd_pcm_channel_area_t *dst_areas; const snd_pcm_channel_area_t *dst_areas;
const snd_pcm_channel_area_t *src_areas; const snd_pcm_channel_area_t *src_areas;
bits = snd_pcm_format_physical_width(pcm->format); bits = snd_pcm_format_physical_width(pcm->format);
if ((bits % 8) != 0) if ((bits % 8) != 0)
interleaved = 0; goto __nointerleaved;
channels = dmix->channels; channels = dmix->channels;
if (channels != dmix->spcm->channels)
goto __nointerleaved;
dst_areas = snd_pcm_mmap_areas(dmix->spcm); dst_areas = snd_pcm_mmap_areas(dmix->spcm);
src_areas = snd_pcm_mmap_areas(pcm); src_areas = snd_pcm_mmap_areas(pcm);
for (chn = 1; chn < channels; chn++) { for (chn = 1; chn < channels; chn++) {
if (dst_areas[chn-1].addr != dst_areas[chn].addr) { if (dst_areas[chn-1].addr != dst_areas[chn].addr)
interleaved = 0; goto __nointerleaved;
break; if (src_areas[chn-1].addr != src_areas[chn].addr)
} goto __nointerleaved;
if (src_areas[chn-1].addr != src_areas[chn].addr) {
interleaved = 0;
break;
}
} }
for (chn = 0; chn < channels; chn++) { for (chn = 0; chn < channels; chn++) {
if (dmix->bindings && dmix->bindings[chn] != chn) { if (dmix->bindings && dmix->bindings[chn] != chn)
interleaved = 0; goto __nointerleaved;
break;
}
if (dst_areas[chn].first != chn * bits || if (dst_areas[chn].first != chn * bits ||
dst_areas[chn].step != channels * bits) { dst_areas[chn].step != channels * bits)
interleaved = 0; goto __nointerleaved;
break;
}
if (src_areas[chn].first != chn * bits || if (src_areas[chn].first != chn * bits ||
src_areas[chn].step != channels * bits) { src_areas[chn].step != channels * bits)
interleaved = 0; goto __nointerleaved;
break;
}
} }
return dmix->interleaved = interleaved; return dmix->interleaved = 1;
__nointerleaved:
return dmix->interleaved = 0;
} }
/* /*