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authorNicolas Kaiser <nikai@nikai.net>2011-03-04 13:49:41 +0000
committerDavid S. Miller <davem@davemloft.net>2011-03-07 15:57:58 -0800
commitce3c869283739379134e1a90c37dd1a30b5f31b7 (patch)
tree781b387b2bf46d494084a080334c7eb4084fbacf /drivers/net/macvtap.c
parentb3ca9b02b00704053a38bfe4c31dbbb9c13595d0 (diff)
drivers/net/macvtap: fix error check
'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>
Diffstat (limited to 'drivers/net/macvtap.c')
-rw-r--r--drivers/net/macvtap.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 5933621ac3f..fc27a9926d9 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -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));