From: Sergey Matyukevich Date: Mon, 3 Feb 2020 10:56:50 +0000 (+0000) Subject: cfg80211: check wiphy driver existence for drvinfo report X-Git-Tag: v4.19.108~78 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a8531cf81da41967ec338cd308468d97f6bbe3dc;p=platform%2Fkernel%2Flinux-rpi.git cfg80211: check wiphy driver existence for drvinfo report [ Upstream commit bfb7bac3a8f47100ebe7961bd14e924c96e21ca7 ] When preparing ethtool drvinfo, check if wiphy driver is defined before dereferencing it. Driver may not exist, e.g. if wiphy is attached to a virtual platform device. Signed-off-by: Sergey Matyukevich Link: https://lore.kernel.org/r/20200203105644.28875-1-sergey.matyukevich.os@quantenna.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- diff --git a/net/wireless/ethtool.c b/net/wireless/ethtool.c index a9c0f36..24e1840 100644 --- a/net/wireless/ethtool.c +++ b/net/wireless/ethtool.c @@ -7,9 +7,13 @@ void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) { struct wireless_dev *wdev = dev->ieee80211_ptr; + struct device *pdev = wiphy_dev(wdev->wiphy); - strlcpy(info->driver, wiphy_dev(wdev->wiphy)->driver->name, - sizeof(info->driver)); + if (pdev->driver) + strlcpy(info->driver, pdev->driver->name, + sizeof(info->driver)); + else + strlcpy(info->driver, "N/A", sizeof(info->driver)); strlcpy(info->version, init_utsname()->release, sizeof(info->version));