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Date: Tue, 2 Apr 2024 12:56:42 +0300
From: Dan Carpenter <dan.carpenter@linaro.org>
To: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Steven Price <steven.price@arm.com>, Liviu Dudau <liviu.dudau@arm.com>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>,
	Heiko Stuebner <heiko@sntech.de>, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] drm/panthor: Fix off by one in panthor_fw_get_cs_iface()
Message-ID: <62835c16-c85c-483d-a8fe-63be78d49d15@moroto.mountain>
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The ->iface.streams[csg_slot][] array has MAX_CS_PER_CSG elements so
this > comparison needs to be >= to prevent an out of bounds access.

Fixes: 2718d91816ee ("drm/panthor: Add the FW logical block")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 drivers/gpu/drm/panthor/panthor_fw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_fw.c b/drivers/gpu/drm/panthor/panthor_fw.c
index 33c87a59834e..181395e2859a 100644
--- a/drivers/gpu/drm/panthor/panthor_fw.c
+++ b/drivers/gpu/drm/panthor/panthor_fw.c
@@ -308,7 +308,7 @@ panthor_fw_get_csg_iface(struct panthor_device *ptdev, u32 csg_slot)
 struct panthor_fw_cs_iface *
 panthor_fw_get_cs_iface(struct panthor_device *ptdev, u32 csg_slot, u32 cs_slot)
 {
-	if (drm_WARN_ON(&ptdev->base, csg_slot >= MAX_CSGS || cs_slot > MAX_CS_PER_CSG))
+	if (drm_WARN_ON(&ptdev->base, csg_slot >= MAX_CSGS || cs_slot >= MAX_CS_PER_CSG))
 		return NULL;
 
 	return &ptdev->fw->iface.streams[csg_slot][cs_slot];
-- 
2.43.0