linux-kernel - [PATCH 1/2] ALSA: firewire-tascam: Fix infinite loop in snd_tscm_stream_get

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Date:   Mon, 15 May 2017 10:19:09 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Clemens Ladisch <clemens@...isch.de>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Takashi Sakamoto <o-takashi@...amocchi.jp>
Cc:     Arnd Bergmann <arnd@...db.de>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 1/2] ALSA: firewire-tascam: Fix infinite loop in snd_tscm_stream_get_rate()

Obviously the intention was to put a limit on the maximum number of
operations.  However, for this to work, the check should be
"&& trials++ < 5", not "|| trials++ < 5".

Fixes: 35efa5c489de63a9 ("ALSA: firewire-tascam: add streaming functionality")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
Compile-tested only.

Triggered by a false-positive warning from gcc-4.1.2:

    warning: ‘err’ may be used uninitialized in this function
---
 sound/firewire/tascam/tascam-stream.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/firewire/tascam/tascam-stream.c b/sound/firewire/tascam/tascam-stream.c
index f1657a4e0621ef49..e433b92ac6904db5 100644
--- a/sound/firewire/tascam/tascam-stream.c
+++ b/sound/firewire/tascam/tascam-stream.c
@@ -84,7 +84,7 @@ int snd_tscm_stream_get_rate(struct snd_tscm *tscm, unsigned int *rate)
 	unsigned int trials = 0;
 	int err;
 
-	while (data == 0x0 || trials++ < 5) {
+	while (data == 0x0 && trials++ < 5) {
 		err = get_clock(tscm, &data);
 		if (err < 0)
 			return err;
-- 
2.7.4