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media: dvb_frontend: ensure that inital front end status initialized 

The fe_status variable s is not initialized meaning it can have any
random garbage status.  This could be problematic if fe->ops.tune is
false as s is not updated by the call to fe->ops.tune() and a
subsequent check on the change status will using a garbage value.
Fix this by adding FE_NONE to the enum fe_status and initializing
s to this.

Detected by CoverityScan, CID#112887 ("Uninitialized scalar variable")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Colin Ian King 2017-07-20 18:12:07 -04:00 committed by Mauro Carvalho Chehab
parent f3ee363fc1
commit a9e4998073
2 changed files with 2 additions and 1 deletions
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2
drivers/media/dvb-core/dvb_frontend.c
View File

@ -631,7 +631,7 @@ static int dvb_frontend_thread(void *data)
struct dvb_frontend *fe = data;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
struct dvb_frontend_private *fepriv = fe->frontend_priv;
enum fe_status s;
enum fe_status s = FE_NONE;
enum dvbfe_algo algo;
bool re_tune = false;
bool semheld = false;

1
include/uapi/linux/dvb/frontend.h
View File

@ -127,6 +127,7 @@ enum fe_sec_mini_cmd {
* to reset DiSEqC, tone and parameters
*/
enum fe_status {
FE_NONE = 0x00,
FE_HAS_SIGNAL = 0x01,
FE_HAS_CARRIER = 0x02,
FE_HAS_VITERBI = 0x04,