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firmware: arm_scmi: Avoid double free in error flow 

If device_register() fails, both put_device() and kfree() are called,
ending with a double free of the scmi_dev.

Calling kfree() is needed only when a failure happens between the
allocation of the scmi_dev and its registration, so move it to there
and remove it from the error flow.

Fixes: 46edb8d132 ("firmware: arm_scmi: provide the mandatory device release callback")
Signed-off-by: Wen Yang <wenyang@linux.alibaba.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Wen Yang 2019-11-25 23:54:09 +08:00 committed by Sudeep Holla
parent 7bd39bc6bf
commit 8305e90a89
1 changed files with 4 additions and 4 deletions
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8
drivers/firmware/arm_scmi/bus.c
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@ -135,8 +135,10 @@ scmi_device_create(struct device_node *np, struct device *parent, int protocol)
return NULL;
id = ida_simple_get(&scmi_bus_id, 1, 0, GFP_KERNEL);
if (id < 0)
goto free_mem;
if (id < 0) {
kfree(scmi_dev);
return NULL;
}
scmi_dev->id = id;
scmi_dev->protocol_id = protocol;
@ -154,8 +156,6 @@ scmi_device_create(struct device_node *np, struct device *parent, int protocol)
put_dev:
put_device(&scmi_dev->dev);
ida_simple_remove(&scmi_bus_id, id);
free_mem:
kfree(scmi_dev);
return NULL;
}