linux-kernel - [PATCH v9 5/5] drm/panthor: Fix race condition when gathering fdinfo group samples

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Message-ID: <20250123225325.3271764-6-adrian.larumbe@collabora.com>
Date: Thu, 23 Jan 2025 22:53:02 +0000
From: Adrián Larumbe <adrian.larumbe@...labora.com>
To: David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Jonathan Corbet <corbet@....net>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>
Cc: kernel@...labora.com,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Tvrtko Ursulin <tvrtko.ursulin@...lia.com>,
	dri-devel@...ts.freedesktop.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Adrián Larumbe <adrian.larumbe@...labora.com>
Subject: [PATCH v9 5/5] drm/panthor: Fix race condition when gathering fdinfo group samples

Commit e16635d88fa0 ("drm/panthor: add DRM fdinfo support") failed to
protect access to groups with an xarray lock, which could lead to
use-after-free errors.

Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
Fixes: e16635d88fa0 ("drm/panthor: add DRM fdinfo support")
---
 drivers/gpu/drm/panthor/panthor_sched.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
index e6c08a694e41..1d283b4bab86 100644
--- a/drivers/gpu/drm/panthor/panthor_sched.c
+++ b/drivers/gpu/drm/panthor/panthor_sched.c
@@ -2865,6 +2865,7 @@ void panthor_fdinfo_gather_group_samples(struct panthor_file *pfile)
 	if (IS_ERR_OR_NULL(gpool))
 		return;
 
+	xa_lock(&gpool->xa);
 	xa_for_each(&gpool->xa, i, group) {
 		mutex_lock(&group->fdinfo.lock);
 		pfile->stats.cycles += group->fdinfo.data.cycles;
@@ -2873,6 +2874,7 @@ void panthor_fdinfo_gather_group_samples(struct panthor_file *pfile)
 		group->fdinfo.data.time = 0;
 		mutex_unlock(&group->fdinfo.lock);
 	}
+	xa_unlock(&gpool->xa);
 }
 
 static void group_sync_upd_work(struct work_struct *work)
-- 
2.47.1