diff options
| author | Sean Wang <sean.wang@mediatek.com> | 2017-07-22 20:45:55 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-24 13:43:23 -0700 |
| commit | 6c7fce6fa86a110d6455662d823c4e09f8f7be4a (patch) | |
| tree | 038a3d9491954e109acb58200ef3129b96e38dbd | |
| parent | 96080f697786e0a30006fcbcc5b53f350fcb3e9f (diff) | |
| download | linux-6c7fce6fa86a110d6455662d823c4e09f8f7be4a.tar.bz2 | |
net: ethernet: mediatek: avoid potential invalid memory access
Potential dangerous invalid memory might be accessed if invalid mac value
reflected from the forward port field in rxd4 caused by possible potential
hardware defects. So added a simple sanity checker to avoid the kind of
situation happening.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index b3d0c2e6347a..3e3232fd7c05 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -947,6 +947,10 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget, RX_DMA_FPORT_MASK; mac--; + if (unlikely(mac < 0 || mac >= MTK_MAC_COUNT || + !eth->netdev[mac])) + goto release_desc; + netdev = eth->netdev[mac]; if (unlikely(test_bit(MTK_RESETTING, ð->state))) |