Re: [PATCH] kexec: prevent double free on image allocation failure
From: Eric W. Biederman
Date: Thu Feb 21 2013 - 20:55:44 EST
Sasha Levin <sasha.levin@xxxxxxxxxx> 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.
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@xxxxxxxxxxxx>
> Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
> 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
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