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Date:   Sat, 30 May 2020 10:41:50 +0800
From:   Jia-Ju Bai <>
        Jia-Ju Bai <>
Subject: [PATCH] net: vmxnet3: fix possible buffer overflow caused by bad DMA value in vmxnet3_get_rss()

The value adapter->rss_conf is stored in DMA memory, and it is assigned
to rssConf, so rssConf->indTableSize can be modified at anytime by
malicious hardware. Because rssConf->indTableSize is assigned to n,
buffer overflow may occur when the code "rssConf->indTable[n]" is

To fix this possible bug, n is checked after being used.

Signed-off-by: Jia-Ju Bai <>
 drivers/net/vmxnet3/vmxnet3_ethtool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/vmxnet3/vmxnet3_ethtool.c b/drivers/net/vmxnet3/vmxnet3_ethtool.c
index 6528940ce5f3..b53bb8bcd47f 100644
--- a/drivers/net/vmxnet3/vmxnet3_ethtool.c
+++ b/drivers/net/vmxnet3/vmxnet3_ethtool.c
@@ -700,6 +700,8 @@ vmxnet3_get_rss(struct net_device *netdev, u32 *p, u8 *key, u8 *hfunc)
 		*hfunc = ETH_RSS_HASH_TOP;
 	if (!p)
 		return 0;
+		return 0;
 	while (n--)
 		p[n] = rssConf->indTable[n];
 	return 0;

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