diff options
| author | Florian Fainelli <f.fainelli@gmail.com> | 2017-01-09 11:58:34 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-15 13:42:55 +0100 |
| commit | 2ff4a0243c9e7b16c4fa1e9b7ab08525f4b11a40 (patch) | |
| tree | daf3d45117a028deca321a91012947074d4d3098 | |
| parent | 66f24d624baaa9934c3288cd01d2b6dd65a399d3 (diff) | |
net: dsa: Ensure validity of dst->ds[0]
[ Upstream commit faf3a932fbeb77860226a8323eacb835edc98648 ]
It is perfectly possible to have non zero indexed switches being present
in a DSA switch tree, in such a case, we will be deferencing a NULL
pointer while dsa_cpu_port_ethtool_{setup,restore}. Be more defensive
and ensure that dst->ds[0] is valid before doing anything with it.
Fixes: 0c73c523cf73 ("net: dsa: Initialize CPU port ethtool ops per tree")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/dsa/dsa2.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index 5fff951a0a49..da3862124545 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -394,9 +394,11 @@ static int dsa_dst_apply(struct dsa_switch_tree *dst) return err; } - err = dsa_cpu_port_ethtool_setup(dst->ds[0]); - if (err) - return err; + if (dst->ds[0]) { + err = dsa_cpu_port_ethtool_setup(dst->ds[0]); + if (err) + return err; + } /* If we use a tagging format that doesn't have an ethertype * field, make sure that all packets from this point on get @@ -433,7 +435,8 @@ static void dsa_dst_unapply(struct dsa_switch_tree *dst) dsa_ds_unapply(dst, ds); } - dsa_cpu_port_ethtool_restore(dst->ds[0]); + if (dst->ds[0]) + dsa_cpu_port_ethtool_restore(dst->ds[0]); pr_info("DSA: tree %d unapplied\n", dst->tree); dst->applied = false; |