| Message ID | 20190504091000.18665-1-baijiaju1990@gmail.com |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | David Miller |
| Headers | show |
| Series | net: wireless: b43: Avoid possible double calls to b43_one_core_detach() | expand |
Jia-Ju Bai <baijiaju1990@gmail.com> writes: > 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> > --- > drivers/net/wireless/broadcom/b43/main.c | 7 +------ > 1 file changed, 1 insertion(+), 6 deletions(-) You can use just "b43:" as prefix, no need to have "net:" nor "wireless:" in the title. I'll fix it this time, but please use correct style in the future. https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches#commit_title_is_wrong
Jia-Ju Bai <baijiaju1990@gmail.com> wrote: > 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> Patch applied to wireless-drivers-next.git, thanks. ec2e93cf1910 b43: Avoid possible double calls to b43_one_core_detach()
diff --git a/drivers/net/wireless/broadcom/b43/main.c b/drivers/net/wireless/broadcom/b43/main.c index 74be3c809225..e666a472a0da 100644 --- a/drivers/net/wireless/broadcom/b43/main.c +++ b/drivers/net/wireless/broadcom/b43/main.c @@ -2610,18 +2610,13 @@ 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); }
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> --- drivers/net/wireless/broadcom/b43/main.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)