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Commit 51a1aaa6 authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211_hwsim: validate number of different channels 



When creating a new radio on the fly, hwsim allows this
to be done with an arbitrary number of channels, but
cfg80211 only supports a limited number of simultaneous
channels, leading to a warning.

Fix this by validating the number - this requires moving
the define for the maximum out to a visible header file.

Reported-by: default avatar <syzbot+8dd9051ff19940290931@syzkaller.appspotmail.com>
Fixes: b59ec8dd ("mac80211_hwsim: fix number of channels in interface combinations")
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent b71d856a

drivers/net/wireless/mac80211_hwsim.c

+5 −0
Original line number Diff line number Diff line
@@ -3121,6 +3121,11 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info) 
	if (info->attrs[HWSIM_ATTR_CHANNELS])

		param.channels = nla_get_u32(info->attrs[HWSIM_ATTR_CHANNELS]);



	if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {

		GENL_SET_ERR_MSG(info, "too many channels specified");

		return -EINVAL;

	}



	if (info->attrs[HWSIM_ATTR_NO_VIF])

		param.no_vif = true;

include/net/cfg80211.h

+2 −0
Original line number Diff line number Diff line
@@ -815,6 +815,8 @@ struct cfg80211_csa_settings { 
	u8 count;

};



#define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10



/**

 * struct iface_combination_params - input parameters for interface combinations

 *

net/wireless/core.h

+0 −2
Original line number Diff line number Diff line
@@ -507,8 +507,6 @@ void cfg80211_stop_p2p_device(struct cfg80211_registered_device *rdev, 
void cfg80211_stop_nan(struct cfg80211_registered_device *rdev,

		       struct wireless_dev *wdev);



#define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10



#ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS

#define CFG80211_DEV_WARN_ON(cond)	WARN_ON(cond)

#else