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uio: Fix an Oops on load

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commit 432798195bbce1f8cd33d1c0284d0538835e25fb upstream.

I was trying to solve a double free but I introduced a more serious
NULL dereference bug.  The problem is that if there is an IRQ which
triggers immediately, then we need "info->uio_dev" but it's not set yet.

This patch puts the original initialization back to how it was and just
sets info->uio_dev to NULL on the error path so it should solve both
the Oops and the double free.

Fixes: f019f07ecf6a ("uio: potential double frees if __uio_register_device() fails")
Reported-by: Mathias Thore <Mathias.Thore@infinera.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Tested-by: Mathias Thore <Mathias.Thore@infinera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2018-10-26 10:19:51 +03:00 • committed by Greg Kroah-Hartman
parent 4bda4fd0e3
commit 1582f07e88
1 changed files with 5 additions and 2 deletions
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7
drivers/uio/uio.c
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@ -842,6 +842,8 @@ 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
@ -853,11 +855,12 @@ int __uio_register_device(struct module *owner,
*/
ret = request_irq(info->irq, uio_interrupt,
info->irq_flags, info->name, idev);
if (ret)
if (ret) {
info->uio_dev = NULL;
goto err_request_irq;
}
}
info->uio_dev = idev;
return 0;
err_request_irq: