ath10k: guard against CE corruption from firmware

In case firmware crashes it may report CE
completions for entries that were never
submitted/filled with meaningful data. This in
turn led to NULL dereferences.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
index e41665f..0b89726 100644
--- a/drivers/net/wireless/ath/ath10k/pci.c
+++ b/drivers/net/wireless/ath/ath10k/pci.c
@@ -1270,6 +1270,13 @@
 		 * Indicate the completion to higer layer to free
 		 * the buffer
 		 */
+
+		if (!netbuf) {
+			ath10k_warn("invalid sk_buff on CE %d - NULL pointer. firmware crashed?\n",
+				    ce_hdl->id);
+			continue;
+		}
+
 		ATH10K_SKB_CB(netbuf)->is_aborted = true;
 		ar_pci->msg_callbacks_current.tx_completion(ar,
 							    netbuf,