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power_supply: tps65217-charger: Fix NULL deref during property export

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This bug leads to:

[    1.906411] Unable to handle kernel NULL pointer dereference at virtual address 0000000c
[    1.914878] pgd = c0004000
[    1.917786] [0000000c] *pgd=00000000
[    1.921536] Internal error: Oops: 5 [#1] SMP ARM
[    1.926357] Modules linked in:
[    1.929556] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.4.5 #18
[    1.936006] Hardware name: Generic AM33XX (Flattened Device Tree)
[    1.942383] Workqueue: events power_supply_changed_work
[    1.947842] task: de2c41c0 ti: de2c8000 task.ti: de2c8000
[    1.953483] PC is at tps65217_ac_get_property+0x14/0x28
[    1.958937] LR is at tps65217_ac_get_property+0x10/0x28

Driver was trying to use drv_data in property get handler. However drv_data
was not set, so it caused NULL pointer dereference. This patch properly
sets drv_data during probe by power_supply_config parameter, so the
property get handler works as desired.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Fixes: 3636859b28 ("power_supply: Add support for tps65217-charger")
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Marcin Niestroj 2016-06-14 15:29:24 +02:00 committed by Sebastian Reichel
parent 5bc28b93a3
commit 362761299e
1 changed files with 5 additions and 1 deletions
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6
drivers/power/tps65217_charger.c
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@ -197,6 +197,7 @@ static int tps65217_charger_probe(struct platform_device *pdev)
{ {
struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent); struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
struct tps65217_charger *charger; struct tps65217_charger *charger;
struct power_supply_config cfg = {};
int ret; int ret;
dev_dbg(&pdev->dev, "%s\n", __func__); dev_dbg(&pdev->dev, "%s\n", __func__);
@ -208,9 +209,12 @@ static int tps65217_charger_probe(struct platform_device *pdev)
charger->tps = tps; charger->tps = tps;
charger->dev = &pdev->dev; charger->dev = &pdev->dev;
cfg.of_node = pdev->dev.of_node;
cfg.drv_data = charger;
charger->ac = devm_power_supply_register(&pdev->dev, charger->ac = devm_power_supply_register(&pdev->dev,
&tps65217_charger_desc, &tps65217_charger_desc,
NULL); &cfg);
if (IS_ERR(charger->ac)) { if (IS_ERR(charger->ac)) {
dev_err(&pdev->dev, "failed: power supply register\n"); dev_err(&pdev->dev, "failed: power supply register\n");
return PTR_ERR(charger->ac); return PTR_ERR(charger->ac);