tree bb33155c3b0cb77622e2352520ccd95b9a377e62
parent 8bb0a88600f0267cfcc245d34f8c4abe8c282713
author Dan Carpenter <dan.carpenter@oracle.com> 1540538391 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1541956906 -0800

uio: Fix an Oops on load

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>