linux-kernel - dvb_frontend_swzigzag(): uninitialized variable usage

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Message-ID: <20061106182714.GA8099@stusta.de>
Date:	Mon, 6 Nov 2006 19:27:14 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	v4l-dvb-maintainer@...uxtv.org
Cc:	linux-kernel@...r.kernel.org
Subject: dvb_frontend_swzigzag(): uninitialized variable usage

The Coverity checker spotted the following in 
drivers/media/dvb/dvb-core/dvb_frontend.c:

<--  snip  -->

...
static void dvb_frontend_swzigzag(struct dvb_frontend *fe)
{
        fe_status_t s;
        struct dvb_frontend_private *fepriv = fe->frontend_priv;

        /* if we've got no parameters, just keep idling */
        if (fepriv->state & FESTATE_IDLE) {
                fepriv->delay = 3*HZ;
                fepriv->quality = 0;
                return;
        }

        /* in SCAN mode, we just set the frontend when asked and leave it alone */
        if (fepriv->tune_mode_flags & FE_TUNE_MODE_ONESHOT) {
                if (fepriv->state & FESTATE_RETUNE) {
                        if (fe->ops.set_frontend)
                                fe->ops.set_frontend(fe, &fepriv->parameters);
                        fepriv->state = FESTATE_TUNED;
                }
                fepriv->delay = 3*HZ;
                fepriv->quality = 0;
                return;
        }

        /* get the frontend status */
        if (fepriv->state & FESTATE_RETUNE) {
                s = 0;
        } else {
                if (fe->ops.read_status)
                        fe->ops.read_status(fe, &s);
                if (s != fepriv->status) {
                        dvb_frontend_add_event(fe, s);
                        fepriv->status = s;
                }
        }
...

<--  snip  -->

Note that in the "if (s != fepriv->status)", "s" could be used 
uninitialized.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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