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mt76: fix potential DMA mapping leak

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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>
This commit is contained in:
Felix Fietkau 2021-03-23 22:47:37 +01:00
parent 4da64fe086
commit b4403cee64
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 @@ static int
mt76_dma_tx_queue_skb_raw(struct mt76_dev *dev, struct mt76_queue *q,
struct sk_buff *skb, u32 tx_info)
{
struct mt76_queue_buf buf;
struct mt76_queue_buf buf = {};
dma_addr_t addr;
if (q->queued + 1 >= q->ndesc - 1)