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svn:author
V 7
git2svn
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svn:date
V 27
2022-04-07T21:21:48.791895Z
K 7
svn:log
V 941
wpa/hostapd: Fix 100% CPU when USB wlan NIC removed

hostapd calls pcap_next(3) to read the next packet off the wlan interface.
pcap_next() returns a pointer to the packet header but does not indicate
success or failure. Unfortunately this results in an infinite loop (100%
CPU) when the wlan device disappears, i.e. when a USB wlan device is
manually removed or a USB error results in the device removal. However
pcap_next_ex(3) does return success or failure. To resolve this we use
pcap_next_ex(), forcing hostapd to exit when the error is encountered.

An error message is printed to syslog or stderr when debugging (-d flag)
is enabled. Unfortunately wpa_printf() only works when debugging is enabled.

PR:		253608
Reported by:	Damjan Jovanovic <damjan.jov@gmail.com>,
		bz (privately)

(cherry picked from commit 6e5d01124fd4dd57899ddd9260c76dbb43543aa7)

Git Hash:   2010c5e3a379c55d188909dcc6c0edb12272983b
Git Author: cy@FreeBSD.org
END