linux-kernel - [PATCH] drm/vmwgfx: Handle surface check failure correctly

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Message-Id: <20241002122429.1981822-1-kniv@yandex-team.ru>
Date: Wed,  2 Oct 2024 15:24:29 +0300
From: Nikolay Kuratov <kniv@...dex-team.ru>
To: linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
	stable@...r.kernel.org,
	lvc-project@...uxtesting.org,
	bcm-kernel-feedback-list@...adcom.com,
	Sinclair Yeh <syeh@...are.com>,
	Zack Rusin <zack.rusin@...adcom.com>,
	Thomas Hellstrom <thellstrom@...are.com>,
	Simona Vetter <simona@...ll.ch>,
	Nikolay Kuratov <kniv@...dex-team.ru>
Subject: [PATCH] drm/vmwgfx: Handle surface check failure correctly

Currently if condition (!bo and !vmw_kms_srf_ok()) was met
we go to err_out with ret == 0.
err_out dereferences vfb if ret == 0, but in our case vfb is still NULL.

Fix this by assigning sensible error to ret.

Found by Linux Verification Center (linuxtesting.org) with SVACE

Signed-off-by: Nikolay Kuratov <kniv@...dex-team.ru>
Cc: stable@...r.kernel.org
Fixes: 810b3e1683d0 ("drm/vmwgfx: Support topology greater than texture size")
---
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 288ed0bb75cb..752510a11e1b 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1539,6 +1539,7 @@ static struct drm_framebuffer *vmw_kms_fb_create(struct drm_device *dev,
 		DRM_ERROR("Surface size cannot exceed %dx%d\n",
 			dev_priv->texture_max_width,
 			dev_priv->texture_max_height);
+		ret = -EINVAL;
 		goto err_out;
 	}
 
-- 
2.34.1