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| author |   Arnd Bergmann <arnd@arndb.de> | 2016-09-30 18:13:49 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-10-03 01:31:48 -0400 |
| commit | fa34cd94fb01fcb8d79d91e009451b37692e94e5 (patch) | |
| tree | 30bdaa265f90d8bd7319b0db866fd48b63c4df94 /net/core/rtnetlink.c | |
| parent | net: pktgen: fix pkt_size (diff) | |
| download | linux-dev-fa34cd94fb01fcb8d79d91e009451b37692e94e5.tar.xz linux-dev-fa34cd94fb01fcb8d79d91e009451b37692e94e5.zip | |
net: rtnl: avoid uninitialized data in IFLA_VF_VLAN_LIST handling
With the newly added support for IFLA_VF_VLAN_LIST netlink messages,
we get a warning about potential uninitialized variable use in
the parsing of the user input when enabling the -Wmaybe-uninitialized
warning:
net/core/rtnetlink.c: In function 'do_setvfinfo':
net/core/rtnetlink.c:1756:9: error: 'ivvl$' may be used uninitialized in this function [-Werror=maybe-uninitialized]
I have not been able to prove whether it is possible to arrive in
this code with an empty IFLA_VF_VLAN_LIST block, but if we do,
then ndo_set_vf_vlan gets called with uninitialized arguments.
This adds an explicit check for an empty list, making it obvious
to the reader and the compiler that this cannot happen.
Fixes: 79aab093a0b5 ("net: Update API for VF vlan protocol 802.1ad support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/rtnetlink.c')
| -rw-r--r-- | net/core/rtnetlink.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 3ac8946bf244..b06d2f46b83e 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1753,6 +1753,9 @@ static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) len++; } + if (len == 0) + return -EINVAL; + err = ops->ndo_set_vf_vlan(dev, ivvl[0]->vf, ivvl[0]->vlan, ivvl[0]->qos, ivvl[0]->vlan_proto); if (err < 0) |