The uio_unregister_device() function assumes that if "info->uio_dev" is
non-NULL that means "info" is fully allocated. Setting info->uio_de
has to be the last thing in the function.
In the current code, if request_threaded_irq() fails then we return with
info->uio_dev set to non-NULL but info is not fully allocated and it can
lead to double frees.
Fixes: beafc54c4e2f ("UIO: Add the User IO core code")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 144cf7365288..cf388c384553 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -957,8 +957,6 @@ int __uio_register_device(struct module *owner,
if (ret)
goto err_uio_dev_add_attributes;
- info->uio_dev = idev;
-
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
/*
* Note that we deliberately don't use devm_request_irq
@@ -975,6 +973,7 @@ int __uio_register_device(struct module *owner,
goto err_request_irq;
}
+ info->uio_dev = idev;
return 0;
err_request_irq:
--
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