linux-kernel - Re: [PATCH] proc/vmcore: fix potential memory leak in vmcore

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Message-ID: <YyBat53TZUK9trX/@MiWiFi-R3L-srv>
Date:   Tue, 13 Sep 2022 18:25:59 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Jianglei Nie <niejianglei2021@....com>
Cc:     vgoyal@...hat.com, dyoung@...hat.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] proc/vmcore: fix potential memory leak in vmcore_init()

On 09/13/22 at 07:35am, Matthew Wilcox wrote:
> On Tue, Sep 13, 2022 at 02:25:01PM +0800, Jianglei Nie wrote:
> >  	}
> > -	elfcorehdr_free(elfcorehdr_addr);
> >  	elfcorehdr_addr = ELFCORE_ADDR_ERR;
> >  
> >  	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &vmcore_proc_ops);
> >  	if (proc_vmcore)
> >  		proc_vmcore->size = vmcore_size;
> > -	return 0;
> > +
> > +fail:
> > +	elfcorehdr_free(elfcorehdr_addr);
> > +	return rc;
> >  }
> 
> Did you test this?  It looks like you now call
> elfcorehdr_free(ELFCORE_ADDR_ERR) if 'rc' is 0.

Right, that will cause problem. It's my fault since I suggested
the current change.

Jianglei, please use your v1 change and post again. Sorry for the
incorrect suggestion.