linux-kernel - [patch] [media] saa7164: poll mask set incorrectly

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20101124053656.GO1522@bicker>
Date:	Wed, 24 Nov 2010 08:36:57 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Steven Toth <stoth@...nellabs.com>,
	Gavin Hurlbut <gjhurlbu@...il.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] [media] saa7164: poll mask set incorrectly

list_first_entry() always returns non-null here.  I think the intent was
to test whether there were any entries in the used list.

Signed-off-by: Dan Carpenter <error27@...il.com>
---
I don't have this hardware so I can't test this.  Please check
carefully.

diff --git a/drivers/media/video/saa7164/saa7164-encoder.c b/drivers/media/video/saa7164/saa7164-encoder.c
index cbb53d0..f4b8ac7 100644
--- a/drivers/media/video/saa7164/saa7164-encoder.c
+++ b/drivers/media/video/saa7164/saa7164-encoder.c
@@ -1238,7 +1238,6 @@ static unsigned int fops_poll(struct file *file, poll_table *wait)
 {
 	struct saa7164_encoder_fh *fh = (struct saa7164_encoder_fh *)file->private_data;
 	struct saa7164_port *port = fh->port;
-	struct saa7164_user_buffer *ubuf;
 	unsigned int mask = 0;
 
 	port->last_poll_msecs_diff = port->last_poll_msecs;
@@ -1271,10 +1270,7 @@ static unsigned int fops_poll(struct file *file, poll_table *wait)
 	}
 
 	/* Pull the first buffer from the used list */
-	ubuf = list_first_entry(&port->list_buf_used.list,
-		struct saa7164_user_buffer, list);
-
-	if (ubuf)
+	if (!list_empty(&port->list_buf_used.list))
 		mask |= POLLIN | POLLRDNORM;
 
 	return mask;
diff --git a/drivers/media/video/saa7164/saa7164-vbi.c b/drivers/media/video/saa7164/saa7164-vbi.c
index 323c7cd..8025631 100644
--- a/drivers/media/video/saa7164/saa7164-vbi.c
+++ b/drivers/media/video/saa7164/saa7164-vbi.c
@@ -1186,7 +1186,6 @@ static unsigned int fops_poll(struct file *file, poll_table *wait)
 {
 	struct saa7164_vbi_fh *fh = (struct saa7164_vbi_fh *)file->private_data;
 	struct saa7164_port *port = fh->port;
-	struct saa7164_user_buffer *ubuf;
 	unsigned int mask = 0;
 
 	port->last_poll_msecs_diff = port->last_poll_msecs;
@@ -1219,10 +1218,7 @@ static unsigned int fops_poll(struct file *file, poll_table *wait)
 	}
 
 	/* Pull the first buffer from the used list */
-	ubuf = list_first_entry(&port->list_buf_used.list,
-		struct saa7164_user_buffer, list);
-
-	if (ubuf)
+	if (!list_empty(&port->list_buf_used.list))
 		mask |= POLLIN | POLLRDNORM;
 
 	return mask;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/