geneve: use the correct nlattr array in NL_SET_ERR_MSG_ATTR

[ Upstream commit 9a7b5b50de8a764671ba1800fe4c52d3b7013901 ]

IFLA_GENEVE_* attributes are in the data array, which is correctly
used when fetching the value, but not when setting the extended
ack. Because IFLA_GENEVE_MAX < IFLA_MAX, we avoid out of bounds
array accesses, but we don't provide a pointer to the invalid
attribute to userspace.

Fixes: a025fb5f49ad ("geneve: Allow configuration of DF behaviour")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 730ab57..aa101f7 100644 (file)
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1207,7 +1207,7 @@ static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
                enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]);
 
                if (df < 0 || df > GENEVE_DF_MAX) {
-                       NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_GENEVE_DF],
+                       NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF],
                                            "Invalid DF attribute");
                        return -EINVAL;
                }