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    Subject[PATCH 3.10 44/86] bridge: Fix double free and memory leak around br_allowed_ingress
    Date
    3.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>

    [ Upstream commit eb7076182d1ae4bc4641534134ed707100d76acc ]

    br_allowed_ingress() has two problems.

    1. If br_allowed_ingress() is called by br_handle_frame_finish() and
    vlan_untag() in br_allowed_ingress() fails, skb will be freed by both
    vlan_untag() and br_handle_frame_finish().

    2. If br_allowed_ingress() is called by br_dev_xmit() and
    br_allowed_ingress() fails, the skb will not be freed.

    Fix these two problems by freeing the skb in br_allowed_ingress()
    if it fails.

    Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/bridge/br_input.c | 2 +-
    net/bridge/br_vlan.c | 7 ++++---
    2 files changed, 5 insertions(+), 4 deletions(-)

    --- a/net/bridge/br_input.c
    +++ b/net/bridge/br_input.c
    @@ -71,7 +71,7 @@ int br_handle_frame_finish(struct sk_buf
    goto drop;

    if (!br_allowed_ingress(p->br, nbp_get_vlan_info(p), skb, &vid))
    - goto drop;
    + goto out;

    /* insert into forwarding database after filtering to avoid spoofing */
    br = p->br;
    --- a/net/bridge/br_vlan.c
    +++ b/net/bridge/br_vlan.c
    @@ -202,7 +202,7 @@ bool br_allowed_ingress(struct net_bridg
    * rejected.
    */
    if (!v)
    - return false;
    + goto drop;

    if (br_vlan_get_tag(skb, vid)) {
    u16 pvid = br_get_pvid(v);
    @@ -212,7 +212,7 @@ bool br_allowed_ingress(struct net_bridg
    * traffic belongs to.
    */
    if (pvid == VLAN_N_VID)
    - return false;
    + goto drop;

    /* PVID is set on this port. Any untagged ingress
    * frame is considered to belong to this vlan.
    @@ -224,7 +224,8 @@ bool br_allowed_ingress(struct net_bridg
    /* Frame had a valid vlan tag. See if vlan is allowed */
    if (test_bit(*vid, v->vlan_bitmap))
    return true;
    -
    +drop:
    + kfree_skb(skb);
    return false;
    }




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