Re: [PATCH RESEND] drm/nouveau: Add a jump label in nouveau_gem_ioctl_pushbuf()

[Lyude Paul <lyude@redhat.com>]

Reviewed-by: Lyude Paul <lyude@redhat.com>

Will push to drm-misc in a moment

On Mon, 2025-03-03 at 18:49 +0100, Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Wed, 5 Apr 2023 18:38:54 +0200
> 
> The label “out_prevalid” was used to jump to another pointer check
> despite of the detail in the implementation of the function
> “nouveau_gem_ioctl_pushbuf” that it was determined already in one case
> that the corresponding variable contained an error pointer
> because of a failed call of the function “u_memcpya”.
> 
> Thus use an additional label.
> 
> This issue was detected by using the Coccinelle software.
> 
> Fixes: 2be65641642e ("drm/nouveau: fix relocations applying logic and a double-free")
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>  drivers/gpu/drm/nouveau/nouveau_gem.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
> index f77e44958037..d87e1cb2c933 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_gem.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
> @@ -814,7 +814,7 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
>  			reloc = u_memcpya(req->relocs, req->nr_relocs, sizeof(*reloc));
>  			if (IS_ERR(reloc)) {
>  				ret = PTR_ERR(reloc);
> -				goto out_prevalid;
> +				goto out_free_bo;
>  			}
> 
>  			goto revalidate;
> @@ -929,6 +929,7 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
>  out_prevalid:
>  	if (!IS_ERR(reloc))
>  		u_free(reloc);
> +out_free_bo:
>  	u_free(bo);
>  	u_free(push);
> 
> --
> 2.40.0
> 
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat

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