iwlwifi: Fix null pointer referencing in iwl_dbgfs_rx_queue_read.

Test for null pointer prior to access.
Print "Not Allocated" if null pointer.

Signed-off-by: Dor Shaish <dor.shaish@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index d9f21bb9d75d..cee3d12eb383 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -1018,8 +1018,13 @@ static ssize_t iwl_dbgfs_rx_queue_read(struct file *file,
                                                 rxq->write);
         pos += scnprintf(buf + pos, bufsz - pos, "free_count: %u\n",
                                                 rxq->free_count);
-        pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
+        if (rxq->rb_stts) {
+                pos += scnprintf(buf + pos, bufsz - pos, "closed_rb_num: %u\n",
                          le16_to_cpu(rxq->rb_stts->closed_rb_num) &  0x0FFF);
+        } else {
+                pos += scnprintf(buf + pos, bufsz - pos,
+                                        "closed_rb_num: Not Allocated\n");
+        }
         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 }