The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 3360acdf839170b612f5b212539694c20e3f16d0 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@xxxxxxxxxx>
Date: Fri, 9 Jun 2017 10:59:07 +0100
Subject: [PATCH] nvmem: core: fix leaks on registration errors
Make sure to deregister and release the nvmem device and underlying
memory on registration errors.
Note that the private data must be freed using put_device() once the
struct device has been initialised.
Also note that there's a related reference leak in the deregistration
function as reported by Mika Westerberg which is being fixed separately.
Fixes: b6c217ab9be6 ("nvmem: Add backwards compatibility support for older EEPROM drivers.")
Fixes: eace75cfdcf7 ("nvmem: Add a simple NVMEM framework for nvmem providers")
Cc: stable <stable@xxxxxxxxxxxxxxx> # 4.3
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Acked-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 8c830a80a648..6cf916d9db6d 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -489,21 +489,24 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
rval = device_add(&nvmem->dev);
if (rval)
- goto out;
+ goto err_put_device;
if (config->compat) {
rval = nvmem_setup_compat(nvmem, config);
if (rval)
- goto out;
+ goto err_device_del;
}
if (config->cells)
nvmem_add_cells(nvmem, config);
return nvmem;
-out:
- ida_simple_remove(&nvmem_ida, nvmem->id);
- kfree(nvmem);
+
+err_device_del:
+ device_del(&nvmem->dev);
+err_put_device:
+ put_device(&nvmem->dev);
+
return ERR_PTR(rval);
}
EXPORT_SYMBOL_GPL(nvmem_register);