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Date:   Sun, 12 Apr 2020 11:11:46 -0700
From:   Jakub Kicinski <>
To:     David Ahern <>
        David Ahern <>,
        Toke Høiland-Jørgensen <>
Subject: Re: [PATCH bpf] xdp: Reset prog in dev_change_xdp_fd when fd is

On Sun, 12 Apr 2020 07:32:04 -0600 David Ahern wrote:
> From: David Ahern <>
> The commit mentioned in the Fixes tag reuses the local prog variable
> when looking up an expected_fd. The variable is not reset when fd < 0
> causing a detach with the expected_fd set to actually call
> dev_xdp_install for the existing program. The end result is that the
> detach does not happen.
> Fixes: 92234c8f15c8 ("xdp: Support specifying expected existing program when attaching XDP")
> Signed-off-by: David Ahern <>
> Cc: Toke Høiland-Jørgensen <>

Reviewed-by: Jakub Kicinski <>

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