wifi: iwlwifi: Validate slots_num before allocating memory

Verify slots_num is valid in iwl_txq_alloc()
Signed-off-by: Anjaneyulu <pagadala.yesu.anjaneyulu@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230614123447.90be48017c1b.I880e451e137c5cd688d5f38b573b0dbf352762b3@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/queue/tx.c

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2020-2022 Intel Corporation
+ * Copyright (C) 2020-2023 Intel Corporation
  */
 #include <net/tso.h>
 #include <linux/tcp.h>
@@ -1027,6 +1027,9 @@ int iwl_txq_alloc(struct iwl_trans *trans, struct iwl_txq *txq, int slots_num,
 	size_t tb0_buf_sz;
 	int i;
 
+	if (WARN_ONCE(slots_num <= 0, "Invalid slots num:%d\n", slots_num))
+		return -EINVAL;
+
 	if (WARN_ON(txq->entries || txq->tfds))
 		return -EINVAL;