linux-kernel - Re: [syzbot] [squashfs?] VFS: Close: file count is zero (use-after-free)

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Message-ID: <0000000000008f57d70619f62fe8@google.com>
Date: Sun, 02 Jun 2024 23:10:10 -0700
From: syzbot <syzbot+b2cfdac9ae5278d4b621@...kaller.appspotmail.com>
To: nightu.pwn@...il.com
Cc: nightu.pwn@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [squashfs?] VFS: Close: file count is zero (use-after-free)

> please test file uaf in udmabuf_create
>
> #syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

want either no args or 2 args (repo, branch), got 1

> 0e1980c40b6e
> ---
>  drivers/dma-buf/udmabuf.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
> index afa8bfd2a2a9..53035c601e92 100644
> --- a/drivers/dma-buf/udmabuf.c
> +++ b/drivers/dma-buf/udmabuf.c
> @@ -382,6 +382,7 @@ static long udmabuf_create(struct miscdevice *device,
>
>                 kfree(folios);
>                 fput(memfd);
> +               memfd = NULL;
>         }
>
>         flags = head->flags & UDMABUF_FLAGS_CLOEXEC ? O_CLOEXEC : 0;
> --