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net: designware: clear padding bytes

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Short frames are padded to the minimum allowed size of 60 bytes.
However, the designware driver sends old data in these padding bytes.
It is common practice to zero out these padding bytes ro prevent
leaking memory contents to other hosts.

Fix the padding code to zero out the padded bytes at the end.

Tested on socfpga gen5.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
This commit is contained in:
Simon Goldschmidt 2018-11-17 10:24:42 +01:00 committed by Joe Hershberger
parent ae8ac8d423
commit 7efb75b114
1 changed files with 4 additions and 2 deletions
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6
drivers/net/designware.c
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@ -380,9 +380,11 @@ static int _dw_eth_send(struct dw_eth_dev *priv, void *packet, int length)
return -EPERM;
}
length = max(length, ETH_ZLEN);
memcpy((void *)data_start, packet, length);
if (length < ETH_ZLEN) {
memset(&((char *)data_start)[length], 0, ETH_ZLEN - length);
length = ETH_ZLEN;
}
/* Flush data to be sent */
flush_dcache_range(data_start, data_end);