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drivers/net/macvtap: fix error check

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'len' is unsigned of type size_t and can't be negative.

Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Kaiser 2011-03-04 13:49:41 +00:00 committed by David S. Miller
parent b3ca9b02b0
commit ce3c869283
1 changed files with 2 additions and 1 deletions
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3
drivers/net/macvtap.c
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@ -528,8 +528,9 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q,
vnet_hdr_len = q->vnet_hdr_sz;
err = -EINVAL;
if ((len -= vnet_hdr_len) < 0)
if (len < vnet_hdr_len)
goto err;
len -= vnet_hdr_len;
err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0,
sizeof(vnet_hdr));