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hc
2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077 
 kernel/kernel/bpf/cgroup.c
....@@ -1516,7 +1516,7 @@
15161516 		goto out;
15171517 	}
15181518 
1519
-	if (ctx.optlen > max_optlen || ctx.optlen < 0) {
1519
+	if (optval && (ctx.optlen > max_optlen || ctx.optlen < 0)) {
15201520 		ret = -EFAULT;
15211521 		goto out;
15221522 	}
....@@ -1530,8 +1530,11 @@
15301530 	}
15311531 
15321532 	if (ctx.optlen != 0) {
1533
-		if (copy_to_user(optval, ctx.optval, ctx.optlen) ||
1534
-		    put_user(ctx.optlen, optlen)) {
1533
+		if (optval && copy_to_user(optval, ctx.optval, ctx.optlen)) {
1534
+			ret = -EFAULT;
1535
+			goto out;
1536
+		}
1537
+		if (put_user(ctx.optlen, optlen)) {
15351538 			ret = -EFAULT;
15361539 			goto out;
15371540 		}