linux-kernel - Re: [PATCH][next] drm/xe/guc: Fix inverted logic on snapshot->copy check

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Message-ID: <7feb0520-0cd3-46fc-8b44-a78d1c3a65bf@intel.com>
Date: Wed, 9 Oct 2024 09:32:46 -0700
From: John Harrison <john.c.harrison@...el.com>
To: Colin Ian King <colin.i.king@...il.com>, Lucas De Marchi
	<lucas.demarchi@...el.com>, Thomas Hellström
	<thomas.hellstrom@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
	<mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>, Julia Filipchuk
	<julia.filipchuk@...el.com>, <intel-xe@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>
CC: <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/xe/guc: Fix inverted logic on snapshot->copy
 check

On 10/9/2024 09:05, Colin Ian King wrote:
> Currently the check to see if snapshot->copy has been allocated is
> inverted and ends up dereferencing snapshot->copy when free'ing
> objects in the array when it is null or not free'ing the objects
> when snapshot->copy is allocated. Fix this by using the correct
> non-null pointer check logic.
>
> Fixes: d8ce1a977226 ("drm/xe/guc: Use a two stage dump for GuC logs and add more info")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
Reviewed-by: John Harrison <John.C.Harrison@...el.com>

Thanks for the fix.

> ---
>   drivers/gpu/drm/xe/xe_guc_log.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/xe/xe_guc_log.c b/drivers/gpu/drm/xe/xe_guc_log.c
> index 93921f04153f..cc70f448d879 100644
> --- a/drivers/gpu/drm/xe/xe_guc_log.c
> +++ b/drivers/gpu/drm/xe/xe_guc_log.c
> @@ -122,7 +122,7 @@ void xe_guc_log_snapshot_free(struct xe_guc_log_snapshot *snapshot)
>   	if (!snapshot)
>   		return;
>   
> -	if (!snapshot->copy) {
> +	if (snapshot->copy) {
>   		for (i = 0; i < snapshot->num_chunks; i++)
>   			kfree(snapshot->copy[i]);
>   		kfree(snapshot->copy);