Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.9 04/45] ARM: OMAP1: ams-delta: Fix possible use of uninitialized field | Date | Wed, 5 Dec 2018 04:46:25 -0500 |
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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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