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firmware: arm_scmi: Avoid double free in error flow

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commit 8305e90a894f82c278c17e51a28459deee78b263 upstream.

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 <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Wen Yang 2019-11-25 23:54:09 +08:00 • committed by Greg Kroah-Hartman
commit 7da501c21a
1 changed files with 4 additions and 4 deletions
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8
drivers/firmware/arm_scmi/bus.c
View file

@ -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;
}