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Date:   Thu, 9 Apr 2020 12:32:19 -0700
From:   Jakub Kicinski <>
To:     Keita Suzuki <>
Cc:,, (open list:NETRONOME ETHERNET DRIVERS), (open list:NETWORKING DRIVERS), (open list)
Subject: Re: [PATCH] nfp: Fix memory leak in nfp_resource_acquire()

On Thu,  9 Apr 2020 17:41:11 +0000 Keita Suzuki wrote:
> This patch fixes a memory leak in nfp_resource_acquire(). res->mutex is
> alllocated in nfp_resource_try_acquire(). However, when
> msleep_interruptible() or time_is_before_eq_jiffies() fails, it falls
> into err_fails path where res is freed, but res->mutex is not.
> Fix this by changing call to free to nfp_resource_release().

I don't see a leak here. Maybe you could rephrase the description to
make things clearer?

AFAICS nfp_resource_try_acquire() calls nfp_cpp_mutex_free(res->mutex)
if it's about to return an error. We can only hit msleep or time check
if it returned an error.

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