linux-kernel - Re: [PATCH v3] net: qrtr: ns: Fix the incorrect usage of rcu_read

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Date:   Tue, 06 Oct 2020 06:02:47 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     manivannan.sadhasivam@...aro.org
Cc:     kuba@...nel.org, bjorn.andersson@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dianders@...omium.org, elder@...aro.org
Subject: Re: [PATCH v3] net: qrtr: ns: Fix the incorrect usage of
 rcu_read_lock()

From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Date: Mon,  5 Oct 2020 12:46:42 +0530

> The rcu_read_lock() is not supposed to lock the kernel_sendmsg() API
> since it has the lock_sock() in qrtr_sendmsg() which will sleep. Hence,
> fix it by excluding the locking for kernel_sendmsg().
> 
> While at it, let's also use radix_tree_deref_retry() to confirm the
> validity of the pointer returned by radix_tree_deref_slot() and use
> radix_tree_iter_resume() to resume iterating the tree properly before
> releasing the lock as suggested by Doug.
> 
> Fixes: a7809ff90ce6 ("net: qrtr: ns: Protect radix_tree_deref_slot() using rcu read locks")
> Reported-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Tested-by: Douglas Anderson <dianders@...omium.org>
> Tested-by: Alex Elder <elder@...aro.org>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Applied, thank you.