linux-kernel - Re: [PATCH v3 1/2] riscv: Safely remove entries from relocation list

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Message-ID: <ZW4dePVEM8sslNAJ@ghost>
Date:   Mon, 4 Dec 2023 10:42:00 -0800
From:   Charlie Jenkins <charlie@...osinc.com>
To:     Andreas Schwab <schwab@...ux-m68k.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Ron Economos <re@...z.net>,
        Samuel Holland <samuel.holland@...ive.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] riscv: Safely remove entries from relocation list

On Mon, Nov 27, 2023 at 11:42:08AM +0100, Andreas Schwab wrote:
> On Nov 22 2023, Charlie Jenkins wrote:
> 
> > @@ -683,17 +700,29 @@ int add_relocation_to_accumulate(struct module *me, int type, void *location,
> >  
> >  	if (!found) {
> >  		rel_head = kmalloc(sizeof(*rel_head), GFP_KERNEL);
> > +
> > +		if (!rel_head)
> > +			return -ENOMEM;
> > +
> >  		rel_head->rel_entry =
> >  			kmalloc(sizeof(struct list_head), GFP_KERNEL);
> > +
> > +		if (!rel_head->rel_entry)
> > +			return -ENOMEM;
> 
> This leaks rel_head on error.
> 
> -- 
> Andreas Schwab, schwab@...ux-m68k.org
> GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
> "And now for something completely different."

Thank you for pointing this out, I fixed this issue in the next version
but forgot to respond to this thread.

https://lore.kernel.org/linux-riscv/20231127-module_linking_freeing-v4-1-a2ca1d7027d0@rivosinc.com/

- Charlie