linux-kernel - Re: [PATCH] isdn: hfcpci: fix potential NULL pointer dereference

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Message-Id: <20190310.105650.162175260208324347.davem@davemloft.net>
Date:   Sun, 10 Mar 2019 10:56:50 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     kjlu@....edu
Cc:     pakki001@....edu, isdn@...ux-pingi.de, baijiaju1990@...il.com,
        gustavo@...eddedor.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] isdn: hfcpci: fix potential NULL pointer dereference

From: Kangjie Lu <kjlu@....edu>
Date: Fri,  8 Mar 2019 23:46:04 -0600

> In case ioremap fails, the fix reports an error and returns.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>

First, you shouldn't print the information log message if this fails.

Second you are leaking hc->hw.fifos, you have to clean up any resources
allocated up until this point if you fail.