diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 267ed45..569609b 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -297,6 +297,9 @@
 	char *buf = kzalloc(mxln, GFP_KERNEL);
 	int sf = 0; /* how many written so far */
 
+	if (!buf)
+		return 0;
+
 	sf += snprintf(buf, mxln - sf, "0x%x\n", local->hw.flags);
 	if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
 		sf += snprintf(buf + sf, mxln - sf, "HAS_RATE_CONTROL\n");