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    Subject[PATCH AUTOSEL 6.1 03/29] ca8210: fix mac_len negative array access
    Date
    From: Alexander Aring <aahringo@redhat.com>

    [ Upstream commit 6c993779ea1d0cccdb3a5d7d45446dd229e610a3 ]

    This patch fixes a buffer overflow access of skb->data if
    ieee802154_hdr_peek_addrs() fails.

    Reported-by: lianhui tang <bluetlh@gmail.com>
    Signed-off-by: Alexander Aring <aahringo@redhat.com>
    Link: https://lore.kernel.org/r/20230217042504.3303396-1-aahringo@redhat.com
    Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/net/ieee802154/ca8210.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
    index e1a569b99e4a6..0b0c6c0764fe9 100644
    --- a/drivers/net/ieee802154/ca8210.c
    +++ b/drivers/net/ieee802154/ca8210.c
    @@ -1913,6 +1913,8 @@ static int ca8210_skb_tx(
    * packet
    */
    mac_len = ieee802154_hdr_peek_addrs(skb, &header);
    + if (mac_len < 0)
    + return mac_len;

    secspec.security_level = header.sec.level;
    secspec.key_id_mode = header.sec.key_id_mode;
    --
    2.39.2
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