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cfg80211: further limit wiphy names to 64 bytes
commit814596495d
upstream. wiphy names were recently limited to 128 bytes by commita7cfebcb75
("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:a7cfebcb75
("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>
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@ -2604,7 +2604,7 @@ enum nl80211_attrs {
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#define NL80211_ATTR_KEYS NL80211_ATTR_KEYS
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#define NL80211_ATTR_FEATURE_FLAGS NL80211_ATTR_FEATURE_FLAGS
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#define NL80211_WIPHY_NAME_MAXLEN 128
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#define NL80211_WIPHY_NAME_MAXLEN 64
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#define NL80211_MAX_SUPP_RATES 32
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#define NL80211_MAX_SUPP_HT_RATES 77
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