File 0021-pcm-multi-Drop-the-fixed-slave_map-in-snd_... of Package alsa

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File 0021-pcm-multi-Drop-the-fixed-slave_map-in-snd_pcm_multi_.patch of Package alsa (Revision 718f2436661872f77df52b9e10df1977)

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From e1143dd9ba350eb19d13d4e298eeb55179712a1e Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 27 Jan 2017 12:01:51 +0100
Subject: [PATCH 21/43] pcm: multi: Drop the fixed slave_map[] in
 snd_pcm_multi_open()
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slave_map[] in snd_pcm_multi_open() is a fixed size array and
obviously we have no overflow check, and eventually the program gets
an error when more than 64 channels are used.

Although we can modify the code to allocate the array dynamically, it
turned out that we can drop the whole slave_map[] thingy in this
function when looking at the code closely.  In the past, it was used
to identify the one-to-many mapping.  But the check was dropped, and
now it's nothing more than a sanity check.

Reported-by: Jörg Müller <joerg.mueller7744@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 src/pcm/pcm_multi.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/src/pcm/pcm_multi.c
+++ b/src/pcm/pcm_multi.c
@@ -1015,7 +1015,6 @@ int snd_pcm_multi_open(snd_pcm_t **pcmp,
 	snd_pcm_multi_t *multi;
 	unsigned int i;
 	snd_pcm_stream_t stream;
-	char slave_map[64][64] = { { 0 } };
 	int err;
 
 	assert(pcmp);
@@ -1059,8 +1058,6 @@ int snd_pcm_multi_open(snd_pcm_t **pcmp,
 		bind->slave_channel = schannels[i];
 		if (sidxs[i] < 0)
 			continue;
-		assert(!slave_map[sidxs[i]][schannels[i]]);
-		slave_map[sidxs[i]][schannels[i]] = 1;
 	}
 	multi->channels_count = channels_count;

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File 0021-pcm-multi-Drop-the-fixed-slave_map-in-snd_pcm_multi_.patch of Package alsa (Revision 718f2436661872f77df52b9e10df1977)

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