Re: [PATCH] drm/i915: Fix memory leak in query_perf_config_list()

[Thorsten Blum <blum@kernel.org>]

On Mon, Aug 31, 2026 at 09:39:58AM +0300, Joonas Lahtinen wrote:
> Quoting Thorsten Blum (2026-08-23 23:50:28)
> > When krealloc() fails, free the original oa_config_ids before returning
> > to avoid a memory leak.
> > 
> > Fixes: 4f6ccc74a85c ("drm/i915: add support for perf configuration queries")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
> > ---
> >  drivers/gpu/drm/i915/i915_query.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
> > index 0c55fb6e9727..11157fb14db3 100644
> > --- a/drivers/gpu/drm/i915/i915_query.c
> > +++ b/drivers/gpu/drm/i915/i915_query.c
> > @@ -403,8 +403,10 @@ static int query_perf_config_list(struct drm_i915_private *i915,
> >                 ids = krealloc(oa_config_ids,
> >                                n_configs * sizeof(*oa_config_ids),
> >                                GFP_KERNEL);
> > -               if (!ids)
> > +               if (!ids) {
> > +                       kfree(oa_config_ids);
> >                         return -ENOMEM;
> 
> Instead of duplicating the code once more, could we just refactor into
> "goto err_ids;" style to clean up the function?
> 
> Regards, Joonas

I think the cleanup should be a separate patch, since this minimal fix
should make it easier to backport to stable.

Thanks,
Thorsten