nvmem: core: initialise nvmem->id early

The error path for wp_gpio attempts to free the IDA nvmem->id, but
this has yet to be assigned, so will always be zero - leaking the
ID allocated by ida_alloc(). Fix this by moving the initialisation
of nvmem->id earlier.

Fixes: f7d8d7dcd978 ("nvmem: fix memory leak in error path")
Cc: stable@vger.kernel.org
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230127104015.23839-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 321d7d6..7394a75 100644 (file)
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -770,6 +770,8 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
                return ERR_PTR(rval);
        }
 
+       nvmem->id = rval;
+
        if (config->wp_gpio)
                nvmem->wp_gpio = config->wp_gpio;
        else if (!config->ignore_wp)
@@ -785,7 +787,6 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
        kref_init(&nvmem->refcnt);
        INIT_LIST_HEAD(&nvmem->cells);
 
-       nvmem->id = rval;
        nvmem->owner = config->owner;
        if (!nvmem->owner && config->dev->driver)
                nvmem->owner = config->dev->driver->owner;