[PATCH] brcm80211: Avoid possible null-pointer dereferences in wlc_phy_radio_init_2056()

[Jia-Ju Bai]

In wlc_phy_radio_init_2056(), regs_SYN_2056_ptr, regs_TX_2056_ptr and
regs_RX_2056_ptr may be not assigned, and thus they are still NULL.
Then, they are used on lines 20042-20050:
    wlc_phy_init_radio_regs(pi, regs_SYN_2056_ptr, (u16) RADIO_2056_SYN);
        wlc_phy_init_radio_regs(pi, regs_TX_2056_ptr, (u16) RADIO_2056_TX0);
        wlc_phy_init_radio_regs(pi, regs_TX_2056_ptr, (u16) RADIO_2056_TX1);
        wlc_phy_init_radio_regs(pi, regs_RX_2056_ptr, (u16) RADIO_2056_RX0);
        wlc_phy_init_radio_regs(pi, regs_RX_2056_ptr, (u16) RADIO_2056_RX1);

Thus, possible null-pointer dereferences may occur.

To avoid these bugs, when these variables are not assigned,
wlc_phy_radio_init_2056() directly returns.

Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
---
 drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c 
b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
index 07f61d6155ea..0c57d48f47b1 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
@@ -20035,7 +20035,7 @@ static void wlc_phy_radio_init_2056(struct brcms_phy 
*pi)
                        break;
 
                default:
-                       break;
+                       return;
                }
        }
 
-- 
2.17.0