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mt76: fix potential DMA mapping leak

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commit b4403cee6400c5f679e9c4a82b91d61aa961eccf upstream.

With buf uninitialized in mt76_dma_tx_queue_skb_raw, its field skip_unmap
could potentially inherit a non-zero value from stack garbage.
If this happens, it will cause DMA mappings for MCU command frames to not be
unmapped after completion

Fixes: 27d5c528a7 ("mt76: fix double DMA unmap of the first buffer on 7615/7915")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felix Fietkau 2021-03-23 22:47:37 +01:00 committed by Greg Kroah-Hartman
parent 95fb153c60
commit 9fa26701cd
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/mediatek/mt76/dma.c
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@ -318,7 +318,7 @@ mt76_dma_tx_queue_skb_raw(struct mt76_dev *dev, enum mt76_txq_id qid,
struct sk_buff *skb, u32 tx_info)
{
struct mt76_queue *q = dev->q_tx[qid];
struct mt76_queue_buf buf;
struct mt76_queue_buf buf = {};
dma_addr_t addr;
if (q->queued + 1 >= q->ndesc - 1)