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Date: Thu, 21 Feb 2013 17:55:27 -0800 From: ebiederm@...ssion.com (Eric W. Biederman) To: Sasha Levin <sasha.levin@...cle.com> Cc: kexec@...ts.infradead.org, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH] kexec: prevent double free on image allocation failure Sasha Levin <sasha.levin@...cle.com> writes: > If kimage_normal_alloc() fails to initialize an allocated kimage, it will free > the image but would still set 'rimage', as a result kexec_load will try > to free it again. > > This would explode as part of the freeing process is accessing internal > members which point to uninitialized memory. Agreed. I don't think that failure path has ever actually been exercised. The code is wrong, and it is worth fixing. Andrew I do you think you could queue this up? I don't have a handy tree. Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com> > Signed-off-by: Sasha Levin <sasha.levin@...cle.com> > --- > kernel/kexec.c | 2 -- > 1 file changed, 2 deletions(-) > > diff --git a/kernel/kexec.c b/kernel/kexec.c > index 2348bd6..855bfbb 100644 > --- a/kernel/kexec.c > +++ b/kernel/kexec.c > @@ -242,8 +242,6 @@ static int kimage_normal_alloc(struct kimage **rimage, unsigned long entry, > if (result) > goto out; > > - *rimage = image; > - > /* > * Find a location for the control code buffer, and add it > * the vector of segments so that it's pages will also be -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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