V4L/DVB (9171): S2API: Stop an OOPS if illegal commands are dumped in S2API.

Quick fix to stop an OOPS if illegal commands are dumped in S2API.

Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c
index 4c3f0d7e355c..f44b64b8e614 100644
--- a/drivers/media/dvb/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb/dvb-core/dvb_frontend.c
@@ -848,6 +848,13 @@ void dtv_property_dump(struct dtv_property *tvp)
 {
         int i;
 
+        if( (tvp->cmd <= 0 || tvp->cmd > DTV_DELIVERY_SYSTEM) &&
+                        tvp->cmd != DTV_API_VERSION) {
+                printk("%s: tvp.cmd = 0x%08x (undefined/unknown/invalid)\n",
+                        __func__, tvp->cmd);
+                return;
+        }
+
         printk("%s() tvp.cmd    = 0x%08x (%s)\n"
                 ,__FUNCTION__
                 ,tvp->cmd