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Date:   Tue, 8 Dec 2020 18:12:44 +0100
From:   Daniel Borkmann <>
To:     Zhu Yanjun <>,,,,,
Subject: Re: [PATCH v2 1/1] xdp: avoid calling kfree twice

On 12/9/20 6:03 AM, Zhu Yanjun wrote:
> In the function xdp_umem_pin_pages, if npgs != umem->npgs and
> npgs >= 0, the function xdp_umem_unpin_pages is called. In this
> function, kfree is called to handle umem->pgs, and then in the
> function xdp_umem_pin_pages, kfree is called again to handle
> umem->pgs. Eventually, umem->pgs is freed twice.
> Acked-by: Björn Töpel <>
> Signed-off-by: Zhu Yanjun <>

Please also fix up the commit log according to Bjorn's prior feedback [0].
If it's just a cleanup, it should state so, the commit message right now
makes it sound like an actual double free bug.


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