b43: Avoid possible double calls to b43_one_core_detach()

In b43_request_firmware(), when ieee80211_register_hw() fails,
b43_one_core_detach() is called. In b43_bcma_remove() and
b43_ssb_remove(), b43_one_core_detach() is called again. In this case,
null-pointer dereferences and double-free problems can occur when
the driver is removed.

To fix this bug, the call to b43_one_core_detach() in
b43_request_firmware() is deleted.

This bug is found by a runtime fuzzing tool named FIZZER written by us.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/broadcom/b43/main.c b/drivers/net/wireless/broadcom/b43/main.c
index 20815a71680b0505420be2c6e76b273f7f0f18ca..b85603e91c7a0417498f8dd03a7e7643e0e54de8 100644 (file)
--- a/drivers/net/wireless/broadcom/b43/main.c
+++ b/drivers/net/wireless/broadcom/b43/main.c
@@ -2590,18 +2590,13 @@ static void b43_request_firmware(struct work_struct *work)
 
        err = ieee80211_register_hw(wl->hw);
        if (err)
-               goto err_one_core_detach;
+               goto out;
        wl->hw_registered = true;
        b43_leds_register(wl->current_dev);
 
        /* Register HW RNG driver */
        b43_rng_init(wl);
 
-       goto out;
-
-err_one_core_detach:
-       b43_one_core_detach(dev->dev);
-
 out:
        kfree(ctx);
 }