ALSA: aloop: Avoid pointer dereference before null-check

Static analysis tools (cppcheck and PVS Studio) report an error
in loopback_snd_timer_period_elapsed() regarding dpcm_play pointer
dereference earlier than its null-check. And although this is a result
of a formal check, and the pointer correctness is also protected
by having a corresponding bit set in the "running" mask, re-ordering
of the lines can imake the code even formally correct and eliminate
those static analysis error reports.

Fixes: 26c53379f98d ("ALSA: aloop: Support selection of snd_timer instead of jiffies")
Reported-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Link: https://lore.kernel.org/r/20191127110622.26105-1-andrew_gabbasov@mentor.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 0ebfbe7..6bb4642 100644 (file)
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -727,10 +727,6 @@ static void loopback_snd_timer_period_elapsed(struct loopback_cable *cable,
 
        dpcm_play = cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
        dpcm_capt = cable->streams[SNDRV_PCM_STREAM_CAPTURE];
-       substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
-                       dpcm_play->substream : NULL;
-       substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ?
-                       dpcm_capt->substream : NULL;
 
        if (event == SNDRV_TIMER_EVENT_MSTOP) {
                if (!dpcm_play ||
@@ -741,6 +737,10 @@ static void loopback_snd_timer_period_elapsed(struct loopback_cable *cable,
                }
        }
 
+       substream_play = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
+                       dpcm_play->substream : NULL;
+       substream_capt = (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) ?
+                       dpcm_capt->substream : NULL;
        valid_runtime = (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) ?
                                dpcm_play->substream->runtime :
                                dpcm_capt->substream->runtime;