From: Johannes Berg <johannes.berg@xxxxxxxxx>
Syzbot continues to try to create mac80211_hwsim radios, and
manages to pass parameters that are later checked with WARN_ON
in cfg80211 - catch another one in hwsim directly.
Reported-by: syzbot+2a12f11c306afe871c1f@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
drivers/net/wireless/mac80211_hwsim.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 18e819d964f1..fe1b0108f06d 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3194,6 +3194,11 @@ 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 < 1) {
+ GENL_SET_ERR_MSG(info, "must have at least one channel");
+ return -EINVAL;
+ }
+
if (param.channels > CFG80211_MAX_NUM_DIFFERENT_CHANNELS) {
GENL_SET_ERR_MSG(info, "too many channels specified");
return -EINVAL;
--
2.14.4
