From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5AED02566 for ; Tue, 18 Apr 2023 12:29:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6753C433EF; Tue, 18 Apr 2023 12:29:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681820985; bh=yl4ZRg6fUPQbkX5eOmCR7ZNSfCgeceTI+6ky0FgmFWE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WugGJ0/HJVSWtwx88xMIr5Io+92ygNG1sfGDVYI9OhOHQE17it/2GG729w89PcLJJ ZDDqtb2agsgY4OTHZJdSWmvoTXIHd4WpX7e8/uxQzXaKhELhIYnZroBKcqALuCoEIC qIKzMvv/hD1cNn5PkqRYDdPo7tj4Fnyx350p9eS8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xu Biang , Dan Carpenter , Takashi Sakamoto , Takashi Iwai Subject: [PATCH 5.4 48/92] ALSA: firewire-tascam: add missing unwind goto in snd_tscm_stream_start_duplex() Date: Tue, 18 Apr 2023 14:21:23 +0200 Message-Id: <20230418120306.534849182@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230418120304.658273364@linuxfoundation.org> References: <20230418120304.658273364@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Xu Biang commit fb4a624f88f658c7b7ae124452bd42eaa8ac7168 upstream. Smatch Warns: sound/firewire/tascam/tascam-stream.c:493 snd_tscm_stream_start_duplex() warn: missing unwind goto? The direct return will cause the stream list of "&tscm->domain" unemptied and the session in "tscm" unfinished if amdtp_domain_start() returns with an error. Fix this by changing the direct return to a goto which will empty the stream list of "&tscm->domain" and finish the session in "tscm". The snd_tscm_stream_start_duplex() function is called in the prepare callback of PCM. According to "ALSA Kernel API Documentation", the prepare callback of PCM will be called many times at each setup. So, if the "&d->streams" list is not emptied, when the prepare callback is called next time, snd_tscm_stream_start_duplex() will receive -EBUSY from amdtp_domain_add_stream() that tries to add an existing stream to the domain. The error handling code after the "error" label will be executed in this case, and the "&d->streams" list will be emptied. So not emptying the "&d->streams" list will not cause an issue. But it is more efficient and readable to empty it on the first error by changing the direct return to a goto statement. The session in "tscm" has been begun before amdtp_domain_start(), so it needs to be finished when amdtp_domain_start() fails. Fixes: c281d46a51e3 ("ALSA: firewire-tascam: support AMDTP domain") Signed-off-by: Xu Biang Reviewed-by: Dan Carpenter Acked-by: Takashi Sakamoto Cc: Link: https://lore.kernel.org/r/20230406132801.105108-1-xubiang@hust.edu.cn Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/firewire/tascam/tascam-stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/sound/firewire/tascam/tascam-stream.c +++ b/sound/firewire/tascam/tascam-stream.c @@ -465,7 +465,7 @@ int snd_tscm_stream_start_duplex(struct err = amdtp_domain_start(&tscm->domain); if (err < 0) - return err; + goto error; if (!amdtp_stream_wait_callback(&tscm->rx_stream, CALLBACK_TIMEOUT) ||