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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: syzbot+8dd9051ff19940290931@syzkaller.appspotmail.com
Fixes: b59ec8dd43 ("mac80211_hwsim: fix number of channels in interface combinations")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
zero-colors
Johannes Berg 2018-01-15 09:32:36 +01:00
parent b71d856ab5
commit 51a1aaa631
3 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/wireless/mac80211_hwsim.c
View File

@ -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;

2
include/net/cfg80211.h
View File

@ -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
*

2
net/wireless/core.h
View File

@ -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