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cfg80211: check wiphy driver existence for drvinfo report

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[ 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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Sergey Matyukevich 2020-02-03 10:56:50 +00:00 • committed by Greg Kroah-Hartman
commit fd206c770d
1 changed files with 6 additions and 2 deletions
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8
net/wireless/ethtool.c
View file

@ -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));