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net: vmxnet3: fix possible buffer overflow caused by bad DMA value in vmxnet3_get_rss()

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[ Upstream commit 3e1c6846b9e108740ef8a37be80314053f5dd52a ]

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
executed.

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

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jia-Ju Bai 2020-05-30 10:41:50 +08:00 • committed by Greg Kroah-Hartman
commit ece6218eea
1 changed files with 2 additions and 0 deletions
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2
drivers/net/vmxnet3/vmxnet3_ethtool.c
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@ -702,6 +702,8 @@ vmxnet3_get_rss(struct net_device *netdev, u32 *p, u8 *key, u8 *hfunc)
*hfunc = ETH_RSS_HASH_TOP;
if (!p)
return 0;
if (n > UPT1_RSS_MAX_IND_TABLE_SIZE)
return 0;
while (n--)
p[n] = rssConf->indTable[n];
return 0;