From: Daniel Mack <daniel@zonque.org>
Date: Tue, 3 Apr 2018 16:51:52 +0000 (+0200)
Subject: wcn36xx: check for DMA mapping errors in wcn36xx_dxe_tx_frame()
X-Git-Tag: v4.18-rc1~114^2~217^2~43^2~42
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=7cae35199bee1cd661926f2d68ac46d07682fc54;p=linux.git

wcn36xx: check for DMA mapping errors in wcn36xx_dxe_tx_frame()

Bail out if the mapping fails. Even though this hasn't occured during
tests, this unlikely case should still be handled.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Acked-by: Ramon Fried <rfried@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
---

diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c
index 2c3b899a88fa..405d350f8708 100644
--- a/drivers/net/wireless/ath/wcn36xx/dxe.c
+++ b/drivers/net/wireless/ath/wcn36xx/dxe.c
@@ -705,6 +705,11 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn,
 					  ctl->skb->data,
 					  ctl->skb->len,
 					  DMA_TO_DEVICE);
+	if (dma_mapping_error(wcn->dev, desc->src_addr_l)) {
+		dev_err(wcn->dev, "unable to DMA map src_addr_l\n");
+		ret = -ENOMEM;
+		goto unlock;
+	}
 
 	desc->dst_addr_l = ch->dxe_wq;
 	desc->fr_len = ctl->skb->len;