Eric Biggers
bc342bc029
cfg80211: further limit wiphy names to 64 bytes
...
commit 814596495dd2b9d4aab92d8f89cf19060d25d2ea upstream.
wiphy names were recently limited to 128 bytes by commit a7cfebcb7594
("cfg80211: limit wiphy names to 128 bytes"). As it turns out though,
this isn't sufficient because dev_vprintk_emit() needs the syslog header
string "SUBSYSTEM=ieee80211\0DEVICE=+ieee80211:$devname" to fit into 128
bytes. This triggered the "device/subsystem name too long" WARN when
the device name was >= 90 bytes. As before, this was reproduced by
syzbot by sending an HWSIM_CMD_NEW_RADIO command to the MAC80211_HWSIM
generic netlink family.
Fix it by further limiting wiphy names to 64 bytes.
Reported-by: syzbot+e64565577af34b3768dc@syzkaller.appspotmail.com
Fixes: a7cfebcb7594 ("cfg80211: limit wiphy names to 128 bytes")
Signed-off-by: Eric Biggers <ebiggers@google.com >
Signed-off-by: Johannes Berg <johannes.berg@intel.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
2018-06-05 11:41:56 +02:00
..
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