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Subject[PATCH 4.19 031/142] ARM: OMAP1: ams-delta: Fix possible use of uninitialized field
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

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

[ 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 dd28d2614d7f..d10d8831f527 100644
--- a/arch/arm/mach-omap1/board-ams-delta.c
+++ b/arch/arm/mach-omap1/board-ams-delta.c
@@ -726,6 +726,9 @@ static void modem_pm(struct uart_port *port, unsigned int state, unsigned old)
struct modem_private_data *priv = port->private_data;
int ret;

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

--
2.19.1


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