linux-kernel - [PATCH v2 22/37] ALSA: seq: Check validity before creating a port object

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230523075358.9672-23-tiwai@suse.de>
Date:   Tue, 23 May 2023 09:53:43 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 22/37] ALSA: seq: Check validity before creating a port object

The client type and the port info validity check should be done before
actually creating a port, instead of unnecessary create-and-scratch.

Reviewed-by: Jaroslav Kysela <perex@...ex.cz>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 sound/core/seq/seq_clientmgr.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 06743114cabf..2dac8c3355fd 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1199,6 +1199,8 @@ static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
 	/* it is not allowed to create the port for an another client */
 	if (info->addr.client != client->number)
 		return -EPERM;
+	if (client->type == USER_CLIENT && info->kernel)
+		return -EINVAL;
 
 	if (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT)
 		port_idx = info->addr.port;
@@ -1208,12 +1210,6 @@ static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
 	if (err < 0)
 		return err;
 
-	if (client->type == USER_CLIENT && info->kernel) {
-		port_idx = port->addr.port;
-		snd_seq_port_unlock(port);
-		snd_seq_delete_port(client, port_idx);
-		return -EINVAL;
-	}
 	if (client->type == KERNEL_CLIENT) {
 		callback = info->kernel;
 		if (callback) {
-- 
2.35.3