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wcn36xx: don't keep reference to skb if transmission failed 

When wcn36xx_dxe_tx_frame() fails to transmit the TX frame, the driver
will call into ieee80211_free_txskb() for the skb in flight, so it'll no
longer be valid. Hence, we shouldn't keep a reference to it in ctl->skb.
Also, if the skb has IEEE80211_TX_CTL_REQ_TX_STATUS set, a pointer to
it will currently remain in wcn->tx_ack_skb, which will potentially lead
to a crash if accessed later.

Fix this by checking the return value of wcn36xx_dxe_tx_frame(), and
nullify wcn->tx_ack_skb again in case of errors. Move the assignment
of ctl->skb in wcn36xx_dxe_tx_frame() so it only happens when the
transmission is successful.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Daniel Mack 2018-04-03 18:51:53 +02:00 committed by Kalle Valo
parent 7cae35199b
commit 271f1e65ff
2 changed files with 17 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/wireless/ath/wcn36xx/dxe.c
View File

@ -693,7 +693,6 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn,
/* Set source address of the SKB we send */
ctl = ctl->next;
ctl->skb = skb;
desc = ctl->desc;
if (ctl->bd_cpu_addr) {
wcn36xx_err("bd_cpu_addr cannot be NULL for skb DXE\n");
@ -702,8 +701,8 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn,
}
desc->src_addr_l = dma_map_single(wcn->dev,
ctl->skb->data,
ctl->skb->len,
skb->data,
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");
@ -711,6 +710,7 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn,
goto unlock;
}
ctl->skb = skb;
desc->dst_addr_l = ch->dxe_wq;
desc->fr_len = ctl->skb->len;

15
drivers/net/wireless/ath/wcn36xx/txrx.c
View File

@ -273,6 +273,7 @@ int wcn36xx_start_tx(struct wcn36xx *wcn,
bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
is_multicast_ether_addr(hdr->addr1);
struct wcn36xx_tx_bd bd;
int ret;
memset(&bd, 0, sizeof(bd));
@ -317,5 +318,17 @@ int wcn36xx_start_tx(struct wcn36xx *wcn,
buff_to_be((u32 *)&bd, sizeof(bd)/sizeof(u32));
bd.tx_bd_sign = 0xbdbdbdbd;
return wcn36xx_dxe_tx_frame(wcn, vif_priv, &bd, skb, is_low);
ret = wcn36xx_dxe_tx_frame(wcn, vif_priv, &bd, skb, is_low);
if (ret && bd.tx_comp) {
/* If the skb has not been transmitted,
* don't keep a reference to it.
*/
spin_lock_irqsave(&wcn->dxe_lock, flags);
wcn->tx_ack_skb = NULL;
spin_unlock_irqrestore(&wcn->dxe_lock, flags);
ieee80211_wake_queues(wcn->hw);
}
return ret;
}