From: Al Viro <viro@ftp.linux.org.uk>
Date: Sun, 22 Jun 2008 17:20:19 +0000 (-0300)
Subject: V4L/DVB (8131): dmx_write: memcpy from user-supplied pointer
X-Git-Tag: v2.6.27-rc1~966^2~184
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=947a080037c6ae47cfe5072eadbd189e3da27ecd;p=linux-2.6

V4L/DVB (8131): dmx_write: memcpy from user-supplied pointer

... copy to kernel memory first

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
---

diff --git a/drivers/media/dvb/dvb-core/demux.h b/drivers/media/dvb/dvb-core/demux.h
index b0d347daae..eb91fd808c 100644
--- a/drivers/media/dvb/dvb-core/demux.h
+++ b/drivers/media/dvb/dvb-core/demux.h
@@ -247,7 +247,7 @@ struct dmx_demux {
 	void* priv;                  /* Pointer to private data of the API client */
 	int (*open) (struct dmx_demux* demux);
 	int (*close) (struct dmx_demux* demux);
-	int (*write) (struct dmx_demux* demux, const char* buf, size_t count);
+	int (*write) (struct dmx_demux* demux, const char __user *buf, size_t count);
 	int (*allocate_ts_feed) (struct dmx_demux* demux,
 				 struct dmx_ts_feed** feed,
 				 dmx_ts_cb callback);
diff --git a/drivers/media/dvb/dvb-core/dvb_demux.c b/drivers/media/dvb/dvb-core/dvb_demux.c
index 934e15fffc..e2eca0b1fe 100644
--- a/drivers/media/dvb/dvb-core/dvb_demux.c
+++ b/drivers/media/dvb/dvb-core/dvb_demux.c
@@ -1056,16 +1056,27 @@ static int dvbdmx_close(struct dmx_demux *demux)
 	return 0;
 }
 
-static int dvbdmx_write(struct dmx_demux *demux, const char *buf, size_t count)
+static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)
 {
 	struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;
+	void *p;
 
 	if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))
 		return -EINVAL;
 
-	if (mutex_lock_interruptible(&dvbdemux->mutex))
+	p = kmalloc(count, GFP_USER);
+	if (!p)
+		return -ENOMEM;
+	if (copy_from_user(p, buf, count)) {
+		kfree(p);
+		return -EFAULT;
+	}
+	if (mutex_lock_interruptible(&dvbdemux->mutex)) {
+		kfree(p);
 		return -ERESTARTSYS;
-	dvb_dmx_swfilter(dvbdemux, (u8 *)buf, count);
+	}
+	dvb_dmx_swfilter(dvbdemux, p, count);
+	kfree(p);
 	mutex_unlock(&dvbdemux->mutex);
 
 	if (signal_pending(current))