Messages in this thread | | | Date | Tue, 31 Jan 2023 18:19:46 +0300 | From | Dan Carpenter <> | Subject | Re: [PATCH] staging: r8188eu: fix NULL check for rcu pointer |
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[ Resending because my email setup is crap and silently eats my out going mail. ]
On Tue, Jan 31, 2023 at 10:00:57AM +0100, Martin Kaiser wrote: > Fix the NULL check for padapter->pnetdev->rx_handler_data. > > The current code calls rcu_dereference while it holds the rcu read lock > and checks the pointer after releasing the lock. An rcu pointer may only be > used between calls to rcu_read_lock and rcu_read_unlock. > > Replace the check with rcu_access_pointer. My understanding is that this > function returns the value of the pointer and needs no locking. We can > then check the pointer but we must not dereference it. > > Signed-off-by: Martin Kaiser <martin@kaiser.cx>
This patch is fine but it's a clean up and not a fix. The original code doesn't dereference "br_port". I guess the new code is faster and especially if you have lockdep enabled, so maybe in that sense it is a fix.
regards, dan carpenter
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