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    Subject[PATCH AUTOSEL 4.9 04/45] ARM: OMAP1: ams-delta: Fix possible use of uninitialized field
    Date
    From: Janusz Krzysztofik <jmkrzyszt@gmail.com>

    [ Upstream commit cec83ff1241ec98113a19385ea9e9cfa9aa4125b ]

    While playing with initialization order of modem device, it has been
    discovered that under some circumstances (early console init, I
    believe) its .pm() callback may be called before the
    uart_port->private_data pointer is initialized from
    plat_serial8250_port->private_data, resulting in NULL pointer
    dereference. Fix it by checking for uninitialized pointer before using
    it in modem_pm().

    Fixes: aabf31737a6a ("ARM: OMAP1: ams-delta: update the modem to use regulator API")
    Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
    Signed-off-by: Tony Lindgren <tony@atomide.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/arm/mach-omap1/board-ams-delta.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
    index 6613a6ff5dbc..c4b634c54fbd 100644
    --- a/arch/arm/mach-omap1/board-ams-delta.c
    +++ b/arch/arm/mach-omap1/board-ams-delta.c
    @@ -511,6 +511,9 @@ static void modem_pm(struct uart_port *port, unsigned int state, unsigned old)
    {
    struct modem_private_data *priv = port->private_data;

    + if (!priv)
    + return;
    +
    if (IS_ERR(priv->regulator))
    return;

    --
    2.17.1
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