Re: [PATCH] drm/i915/gvt: fix memory leak of a cmd_entry struct on error exit path

[Chris Wilson]

Quoting Colin King (2018-04-10 13:33:12)
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> 
> The error exit path when a duplicate is found does not kfree and cmd_entry
> struct and hence there is a small memory leak.  Fix this by kfree'ing it.
> 
> Detected by CoverityScan, CID#1370198 ("Resource Leak")
> 
> Fixes: be1da7070aea ("drm/i915/gvt: vGPU command scanner")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/gvt/cmd_parser.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
> index d85939bd7b47..3b6d26c44e37 100644
> --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
> +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
> @@ -2864,6 +2864,7 @@ static int init_cmd_table(struct intel_gvt *gvt)
>                 if (info) {
>                         gvt_err("%s %s duplicated\n", e->info->name,
>                                         info->name);
> +                       kfree(e);

e kzalloc'ed moments above, not yet added to any lists, so fine to use
kfree.

Alternatively, the find_cmd_entry_any_ring() could be moved ahead of the
kzalloc as this function must be externally serialised.

Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris