brcmfmac: fix brcmf_wiphy_wowl_params() NULL pointer dereference

The kernel BUG happens when wowl is enabled from firmware. In
brcmf_wiphy_wowl_params(), cfg is a NULL pointer because it is
drvr->config returned from wiphy_to_cfg(), and drvr->config is not set
yet. To fix it, set drvr->config before brcmf_setup_wiphy() which
calls brcmf_wiphy_wowl_params().

Fixes: 856d5a011c86 ("brcmfmac: allocate struct brcmf_pub instance using wiphy_new()")
Signed-off-by: Winnie Chang <winnie.chang@cypress.com>
Signed-off-by: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 24c4e18e7d806059be23eb7c13bb805bc5f9d0b7..5444e6213d4592e6ac35dd1889c82e4a8d62db97 100644 (file)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -6926,15 +6926,15 @@ struct brcmf_cfg80211_info *brcmf_cfg80211_attach(struct brcmf_pub *drvr,
        cfg->d11inf.io_type = (u8)io_type;
        brcmu_d11_attach(&cfg->d11inf);
 
-       err = brcmf_setup_wiphy(wiphy, ifp);
-       if (err < 0)
-               goto priv_out;
-
        /* regulatory notifer below needs access to cfg so
         * assign it now.
         */
        drvr->config = cfg;
 
+       err = brcmf_setup_wiphy(wiphy, ifp);
+       if (err < 0)
+               goto priv_out;
+
        brcmf_dbg(INFO, "Registering custom regulatory\n");
        wiphy->reg_notifier = brcmf_cfg80211_reg_notifier;
        wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;