From: Zubin Mithra <zsm@chromium.org>
Date: Thu, 4 Apr 2019 21:33:55 +0000 (-0700)
Subject: ALSA: seq: Fix OOB-reads from strlcpy
X-Git-Tag: v3.16.72~87
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5717589a3e9c56040d4596eff74d42598b3ac645;p=thirdparty%2Fkernel%2Fstable.git

ALSA: seq: Fix OOB-reads from strlcpy

commit 212ac181c158c09038c474ba68068be49caecebb upstream.

When ioctl calls are made with non-null-terminated userspace strings,
strlcpy causes an OOB-read from within strlen. Fix by changing to use
strscpy instead.

Signed-off-by: Zubin Mithra <zsm@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 60fb2c708d75c..f6396e012a0ff 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -1249,7 +1249,7 @@ static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
 
 	/* fill the info fields */
 	if (client_info.name[0])
-		strlcpy(client->name, client_info.name, sizeof(client->name));
+		strscpy(client->name, client_info.name, sizeof(client->name));
 
 	client->filter = client_info.filter;
 	client->event_lost = client_info.event_lost;
@@ -1564,7 +1564,7 @@ static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
 	/* set queue name */
 	if (! info.name[0])
 		snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
-	strlcpy(q->name, info.name, sizeof(q->name));
+	strscpy(q->name, info.name, sizeof(q->name));
 	queuefree(q);
 
 	if (copy_to_user(arg, &info, sizeof(info)))
@@ -1642,7 +1642,7 @@ static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
 		queuefree(q);
 		return -EPERM;
 	}
-	strlcpy(q->name, info.name, sizeof(q->name));
+	strscpy(q->name, info.name, sizeof(q->name));
 	queuefree(q);
 
 	return 0;