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authorJohannes Berg <johannes.berg@intel.com>2017-02-27 17:15:28 +0100
committerJohannes Berg <johannes.berg@intel.com>2017-02-27 17:15:28 +0100
commitff4dd73dd2b4806419f8ff65cbce11d5019548d0 (patch)
tree9b89283d30c9398a343851bca77f4f1d34465ac3
parent09e0a2fe102208cbaf39510b8b04dd524d7d2935 (diff)
downloadlinux-ff4dd73dd2b4806419f8ff65cbce11d5019548d0.tar.gz
mac80211_hwsim: check HWSIM_ATTR_RADIO_NAME length
Unfortunately, the nla policy was defined to have HWSIM_ATTR_RADIO_NAME as an NLA_STRING, rather than NLA_NUL_STRING, so we can't use it as a NUL-terminated string in the kernel. Rather than break the API, kasprintf() the string to a new buffer to guarantee NUL termination. Reported-by: Andrew Zaborowski <andrew.zaborowski@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--drivers/net/wireless/mac80211_hwsim.c28
1 files changed, 21 insertions, 7 deletions
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 0889fc8..50c219f 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3056,6 +3056,7 @@ static int hwsim_register_received_nl(struct sk_buff *skb_2,
static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
{
struct hwsim_new_radio_params param = { 0 };
+ const char *hwname = NULL;
param.reg_strict = info->attrs[HWSIM_ATTR_REG_STRICT_REG];
param.p2p_device = info->attrs[HWSIM_ATTR_SUPPORT_P2P_DEVICE];
@@ -3069,8 +3070,14 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
if (info->attrs[HWSIM_ATTR_NO_VIF])
param.no_vif = true;
- if (info->attrs[HWSIM_ATTR_RADIO_NAME])
- param.hwname = nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]);
+ if (info->attrs[HWSIM_ATTR_RADIO_NAME]) {
+ hwname = kasprintf(GFP_KERNEL, "%.*s",
+ nla_len(info->attrs[HWSIM_ATTR_RADIO_NAME]),
+ (char *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]));
+ if (!hwname)
+ return -ENOMEM;
+ param.hwname = hwname;
+ }
if (info->attrs[HWSIM_ATTR_USE_CHANCTX])
param.use_chanctx = true;
@@ -3098,11 +3105,15 @@ static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)
s64 idx = -1;
const char *hwname = NULL;
- if (info->attrs[HWSIM_ATTR_RADIO_ID])
+ if (info->attrs[HWSIM_ATTR_RADIO_ID]) {
idx = nla_get_u32(info->attrs[HWSIM_ATTR_RADIO_ID]);
- else if (info->attrs[HWSIM_ATTR_RADIO_NAME])
- hwname = (void *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]);
- else
+ } else if (info->attrs[HWSIM_ATTR_RADIO_NAME]) {
+ hwname = kasprintf(GFP_KERNEL, "%.*s",
+ nla_len(info->attrs[HWSIM_ATTR_RADIO_NAME]),
+ (char *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]));
+ if (!hwname)
+ return -ENOMEM;
+ } else
return -EINVAL;
spin_lock_bh(&hwsim_radio_lock);
@@ -3111,7 +3122,8 @@ static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)
if (data->idx != idx)
continue;
} else {
- if (strcmp(hwname, wiphy_name(data->hw->wiphy)))
+ if (!hwname ||
+ strcmp(hwname, wiphy_name(data->hw->wiphy)))
continue;
}
@@ -3122,10 +3134,12 @@ static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)
spin_unlock_bh(&hwsim_radio_lock);
mac80211_hwsim_del_radio(data, wiphy_name(data->hw->wiphy),
info);
+ kfree(hwname);
return 0;
}
spin_unlock_bh(&hwsim_radio_lock);
+ kfree(hwname);
return -ENODEV;
}