linux-kernel - Re: [syzbot] Fix use-after-free in udmabuf

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Date: Sun, 02 Jun 2024 22:42:44 -0700
From: syzbot <syzbot+b2cfdac9ae5278d4b621@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Fix use-after-free in udmabuf_create

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Subject: Fix use-after-free in udmabuf_create
Author: nightu.pwn@...il.com

please test file uaf in udmabuf_create

#syz test
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
0e1980c40b6e

--- 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;