Commit f019f07e authored Aug 02, 2018 by Dan Carpenter Committed by Greg Kroah-Hartman Aug 02, 2018

uio: potential double frees if __uio_register_device() fails



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: beafc54c ("UIO: Add the User IO core code")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent c01513b4

drivers/uio/uio.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -953,8 +953,6 @@ 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
		@@ -971,6 +969,7 @@ int __uio_register_device(struct module *owner,
		goto err_request_irq;
		}

		info->uio_dev = idev;
		return 0;

		err_request_irq:

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