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staging: mt7621-dma: fix potentially dereferencing uninitialized 'tx_desc'

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Function 'mtk_hsdma_start_transfer' uses 'tx_desc' pointer which can be
dereferenced before it is initializated. Initializate pointer before
avoiding the problem.

Fixes: 0853c7a53e ("staging: mt7621-dma: ralink: add rt2880 dma engine")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergio Paracuellos 2018-10-20 13:31:06 +02:00 committed by Greg Kroah-Hartman
parent 4dc2a3cd27
commit 354e379684
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/mt7621-dma/mtk-hsdma.c
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@ -335,6 +335,8 @@ static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma,
/* tx desc */
src = sg->src_addr;
for (i = 0; i < chan->desc->num_sgs; i++) {
tx_desc = &chan->tx_ring[chan->tx_idx];
if (len > HSDMA_MAX_PLEN)
tlen = HSDMA_MAX_PLEN;
else
@ -344,7 +346,6 @@ static int mtk_hsdma_start_transfer(struct mtk_hsdam_engine *hsdma,
tx_desc->addr1 = src;
tx_desc->flags |= HSDMA_DESC_PLEN1(tlen);
} else {
tx_desc = &chan->tx_ring[chan->tx_idx];
tx_desc->addr0 = src;
tx_desc->flags = HSDMA_DESC_PLEN0(tlen);