linux-kernel - [PATCH 5.18 0337/1095] drm/vkms: check plane

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Message-Id: <20220815180443.743885616@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:55:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        André Almeida <andrealmeid@...eup.net>,
        Tales Lelo da Aparecida <tales.aparecida@...il.com>,
        Melissa Wen <melissa.srw@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0337/1095] drm/vkms: check plane_composer->map[0] before using it

From: Tales Lelo da Aparecida <tales.aparecida@...il.com>

[ Upstream commit 24f6fe3226c6f9f1b8406311a96b59c6e650b707 ]

Fix a copypasta error. The caller of compose_plane() already checks
primary_composer->map. In contrast, plane_composer->map is never
verified here before handling.

Fixes: 7938f4218168 ("dma-buf-map: Rename to iosys-map")
Reviewed-by: André Almeida <andrealmeid@...eup.net>
Signed-off-by: Tales Lelo da Aparecida <tales.aparecida@...il.com>
Signed-off-by: Melissa Wen <melissa.srw@...il.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220415111300.61013-2-tales.aparecida@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/vkms/vkms_composer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
index c6a1036bf2ea..b47ac170108c 100644
--- a/drivers/gpu/drm/vkms/vkms_composer.c
+++ b/drivers/gpu/drm/vkms/vkms_composer.c
@@ -157,7 +157,7 @@ static void compose_plane(struct vkms_composer *primary_composer,
 	void *vaddr;
 	void (*pixel_blend)(const u8 *p_src, u8 *p_dst);
 
-	if (WARN_ON(iosys_map_is_null(&primary_composer->map[0])))
+	if (WARN_ON(iosys_map_is_null(&plane_composer->map[0])))
 		return;
 
 	vaddr = plane_composer->map[0].vaddr;
-- 
2.35.1