linux-kernel - b43{,legacy}_start can return uninitialized value

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Date:	Sun, 14 Oct 2007 19:51:42 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	mb@...sch.de, st3@...eup.net, Larry.Finger@...inger.net
Cc:	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: b43{,legacy}_start can return uninitialized value

drivers/net/wireless/b43/main.c:b43_start() consists of the
following code:

<--  snip -->

static int b43_start(struct ieee80211_hw *hw)
{
        struct b43_wl *wl = hw_to_b43_wl(hw);
        struct b43_wldev *dev = wl->current_dev;
        int did_init = 0;
        int err;

        mutex_lock(&wl->mutex);

        if (b43_status(dev) < B43_STAT_INITIALIZED) {
                err = b43_wireless_core_init(dev);
                if (err)
                        goto out_mutex_unlock;
                did_init = 1;
        }

        if (b43_status(dev) < B43_STAT_STARTED) {
                err = b43_wireless_core_start(dev);
                if (err) {
                        if (did_init)
                                b43_wireless_core_exit(dev);
                        goto out_mutex_unlock;
                }
        }

 out_mutex_unlock:
        mutex_unlock(&wl->mutex);

        return err;
}

<--  snip  -->


If (b43_status(dev) == B43_STAT_STARTED) this function returns the value 
of an uninitialized variable.

drivers/net/wireless/b43legacy/main.c:b43legacy_start() has the same 
issue.

Spotted by the Coverity checker.


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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