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net: dsa: Fix use after free in dsa_switch_remove()

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The order in which the ports are deleted from the list and freed and the
call to dsa_switch_remove() is done is reversed, which leads to an
use after free condition. Reverse the two: first tear down the ports and
switch from the fabric, then free the ports associated with that switch
fabric.

Fixes: 05f294a85235 ("net: dsa: allocate ports on touch")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2019-11-02 20:13:26 -07:00 committed by David S. Miller
parent 2bceefbe55
commit c058f6dfeb
1 changed files with 2 additions and 1 deletions

3
net/dsa/dsa2.c

@ -874,12 +874,13 @@ static void dsa_switch_remove(struct dsa_switch *ds)
struct dsa_switch_tree *dst = ds->dst;
struct dsa_port *dp, *next;
dsa_tree_teardown(dst);
list_for_each_entry_safe(dp, next, &dst->ports, list) {
list_del(&dp->list);
kfree(dp);
}
dsa_tree_teardown(dst);
dsa_tree_put(dst);
}