If, for some reason, reading the hwmodel register on
xc4000 fails, it will cause the following logig to
use a random value, as reported by smatch:
drivers/media/tuners/xc4000.c:1047 check_firmware() error: uninitialized symbol 'hwmodel'.
drivers/media/tuners/xc4000.c:1060 check_firmware() error: uninitialized symbol 'hwmodel'.
drivers/media/tuners/xc4000.c:1064 check_firmware() error: uninitialized symbol 'hwmodel'.
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
---
drivers/media/tuners/xc4000.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/media/tuners/xc4000.c b/drivers/media/tuners/xc4000.c
index e30948e4ff87..2113ce594f75 100644
--- a/drivers/media/tuners/xc4000.c
+++ b/drivers/media/tuners/xc4000.c
@@ -1036,7 +1036,10 @@ static int check_firmware(struct dvb_frontend *fe, unsigned int type,
dprintk(1, "load scode failed %d\n", rc);
check_device:
- rc = xc4000_readreg(priv, XREG_PRODUCT_ID, &hwmodel);
+ if (xc4000_readreg(priv, XREG_PRODUCT_ID, &hwmodel) < 0) {
+ printk(KERN_ERR "Unable to read tuner registers.\n");
+ goto fail;
+ }
if (xc_get_version(priv, &hw_major, &hw_minor, &fw_major,
&fw_minor) != 0) {
--
2.13.6
