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net: dsa: Ensure validity of dst->ds[0]

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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>
This commit is contained in:
Florian Fainelli 2017-01-09 11:58:34 -08:00 committed by David S. Miller
parent d9584d8ccc
commit faf3a932fb
1 changed files with 7 additions and 4 deletions
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11
net/dsa/dsa2.c
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@ -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;