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net: enetc: fix array underflow in error handling code 

This loop will try to unmap enetc_unmap_tx_buff[-1] and crash.

Fixes: 9d2b68cc10 ("net: enetc: add support for XDP_REDIRECT")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/YHBHfCY/yv3EnM9z@mwanda
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Dan Carpenter 2021-04-09 15:24:28 +03:00 committed by Jakub Kicinski
parent 524e001b7d
commit 626b598aa8
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/freescale/enetc/enetc.c
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@ -895,7 +895,7 @@ static int enetc_xdp_frame_to_xdp_tx_swbd(struct enetc_bdr *tx_ring,
dma = dma_map_single(tx_ring->dev, data, len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(tx_ring->dev, dma))) {
/* Undo the DMA mapping for all fragments */
while (n-- >= 0)
while (--n >= 0)
enetc_unmap_tx_buff(tx_ring, &xdp_tx_arr[n]);
netdev_err(tx_ring->ndev, "DMA map error\n");