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b43legacy: fix use-after-free rfkill bug

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Fix rfkill code which caused a use-after-free bug. Thanks to David
Woodhouse for spotting this out.

Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stefano Brivio 2008-01-13 18:35:52 +01:00 committed by David S. Miller
parent 66dcb6bdc5
commit 222b01b7fe
1 changed files with 6 additions and 5 deletions
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11
drivers/net/wireless/b43legacy/rfkill.c
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@ -141,8 +141,11 @@ void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
rfk->rfkill->user_claim_unsupported = 1; rfk->rfkill->user_claim_unsupported = 1;
rfk->poll_dev = input_allocate_polled_device(); rfk->poll_dev = input_allocate_polled_device();
if (!rfk->poll_dev) if (!rfk->poll_dev) {
goto err_free_rfk; rfkill_free(rfk->rfkill);
goto err_freed_rfk;
}
rfk->poll_dev->private = dev; rfk->poll_dev->private = dev;
rfk->poll_dev->poll = b43legacy_rfkill_poll; rfk->poll_dev->poll = b43legacy_rfkill_poll;
rfk->poll_dev->poll_interval = 1000; /* msecs */ rfk->poll_dev->poll_interval = 1000; /* msecs */
@ -178,8 +181,7 @@ void b43legacy_rfkill_init(struct b43legacy_wldev *dev)
err_free_polldev: err_free_polldev:
input_free_polled_device(rfk->poll_dev); input_free_polled_device(rfk->poll_dev);
rfk->poll_dev = NULL; rfk->poll_dev = NULL;
err_free_rfk: err_freed_rfk:
rfkill_free(rfk->rfkill);
rfk->rfkill = NULL; rfk->rfkill = NULL;
out_error: out_error:
rfk->registered = 0; rfk->registered = 0;
@ -198,7 +200,6 @@ void b43legacy_rfkill_exit(struct b43legacy_wldev *dev)
rfkill_unregister(rfk->rfkill); rfkill_unregister(rfk->rfkill);
input_free_polled_device(rfk->poll_dev); input_free_polled_device(rfk->poll_dev);
rfk->poll_dev = NULL; rfk->poll_dev = NULL;
rfkill_free(rfk->rfkill);
rfk->rfkill = NULL; rfk->rfkill = NULL;
} }