linux-kernel - Re: [PATCH] vfio: Fix NULL pointer dereference caused by uninitialized group->iommufd

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Date:   Wed, 22 Feb 2023 08:58:30 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Yan Zhao <yan.y.zhao@...el.com>
Cc:     alex.williamson@...hat.com, kevin.tian@...el.com,
        yi.l.liu@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio: Fix NULL pointer dereference caused by
 uninitialized group->iommufd

On Wed, Feb 22, 2023 at 03:49:38PM +0800, Yan Zhao wrote:
> group->iommufd is not initialized for the iommufd_ctx_put()
> 
> [20018.331541] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [20018.377508] RIP: 0010:iommufd_ctx_put+0x5/0x10 [iommufd]
> ...
> [20018.476483] Call Trace:
> [20018.479214]  <TASK>
> [20018.481555]  vfio_group_fops_unl_ioctl+0x506/0x690 [vfio]
> [20018.487586]  __x64_sys_ioctl+0x6a/0xb0
> [20018.491773]  ? trace_hardirqs_on+0xc5/0xe0
> [20018.496347]  do_syscall_64+0x67/0x90
> [20018.500340]  entry_SYSCALL_64_after_hwframe+0x4b/0xb5
> 
> Fixes: 9eefba8002c2 ("vfio: Move vfio group specific code into group.c")
> Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
> ---
>  drivers/vfio/group.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason