HID: intel_ish-hid: Add check for ishtp_dma_tx_map

As the kcalloc may return NULL pointer,
it should be better to check the ishtp_dma_tx_map
before use in order to avoid NULL pointer dereference.

Fixes: 3703f53b99e4 ("HID: intel_ish-hid: ISH Transport layer")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/intel-ish-hid/ishtp/dma-if.c b/drivers/hid/intel-ish-hid/ishtp/dma-if.c
index 40554c8..00046cb 100644 (file)
--- a/drivers/hid/intel-ish-hid/ishtp/dma-if.c
+++ b/drivers/hid/intel-ish-hid/ishtp/dma-if.c
@@ -104,6 +104,11 @@ void *ishtp_cl_get_dma_send_buf(struct ishtp_device *dev,
        int required_slots = (size / DMA_SLOT_SIZE)
                + 1 * (size % DMA_SLOT_SIZE != 0);
 
+       if (!dev->ishtp_dma_tx_map) {
+               dev_err(dev->devc, "Fail to allocate Tx map\n");
+               return NULL;
+       }
+
        spin_lock_irqsave(&dev->ishtp_dma_tx_lock, flags);
        for (i = 0; i <= (dev->ishtp_dma_num_slots - required_slots); i++) {
                free = 1;
@@ -150,6 +155,11 @@ void ishtp_cl_release_dma_acked_mem(struct ishtp_device *dev,
                return;
        }
 
+       if (!dev->ishtp_dma_tx_map) {
+               dev_err(dev->devc, "Fail to allocate Tx map\n");
+               return;
+       }
+
        i = (msg_addr - dev->ishtp_host_dma_tx_buf) / DMA_SLOT_SIZE;
        spin_lock_irqsave(&dev->ishtp_dma_tx_lock, flags);
        for (j = 0; j < acked_slots; j++) {