[vireshk:virtio/msg-xen 3/23] drivers/firmware/arm_ffa/driver.c:1282:7-14: WARNING opportunity for kmemdup

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git virtio/msg-xen
head:   2e3356784e87f20c8375b12adebc1e706091c1c8
commit: c92b9202ffe8dca2c24ebc943f52ed20d4a8dafc [3/23] firmware: arm_ffa: Add support for framework notifications
config: arm64-randconfig-r053-20250117 (https://download.01.org/0day-ci/archive/20250117/202501172022.oicUGCNf-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.2.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202501172022.oicUGCNf-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> drivers/firmware/arm_ffa/driver.c:1282:7-14: WARNING opportunity for kmemdup

vim +1282 drivers/firmware/arm_ffa/driver.c

  1267	
  1268	static void handle_framework_notif_callbacks(u64 bitmap)
  1269	{
  1270		int notify_id = 0, recv_vm_id;
  1271		struct ffa_indirect_msg_hdr *msg, *buf;
  1272		struct notifier_cb_info *cb_info = NULL;
  1273	
  1274		/* Only one framework notification defined and supported */
  1275		if (!(bitmap & FRAMEWORK_NOTIFY_RX_BUFFER_FULL))
  1276			return;
  1277	
  1278		mutex_lock(&drv_info->rx_lock);
  1279	
  1280		msg = drv_info->rx_buffer;
  1281		recv_vm_id = RECEIVER_ID(msg->send_recv_id);
> 1282		buf = kmalloc(sizeof(*buf) + msg->size, GFP_KERNEL);
  1283		if (!buf) {
  1284			mutex_unlock(&drv_info->rx_lock);
  1285			return;
  1286		}
  1287		memcpy(buf, msg + msg->offset, sizeof(*buf) + msg->size);
  1288		buf->offset = sizeof(*buf);
  1289		mutex_unlock(&drv_info->rx_lock);
  1290	
  1291		ffa_rx_release();
  1292	
  1293		mutex_lock(&drv_info->notify_lock);
  1294		cb_info = notifier_hash_node_get(notify_id, recv_vm_id, true);
  1295		mutex_unlock(&drv_info->notify_lock);
  1296	
  1297		if (cb_info && cb_info->cb)
  1298			cb_info->cb(notify_id, buf);
  1299		kfree(buf);
  1300	}
  1301	

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