4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nikolay Kuratov <kniv@xxxxxxxxxxxxxx>
commit 26498b8d54373d31a621d7dec95c4bd842563b3b upstream.
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@xxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 810b3e1683d0 ("drm/vmwgfx: Support topology greater than texture size")
Signed-off-by: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20241002122429.1981822-1-kniv@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1468,6 +1468,7 @@ static struct drm_framebuffer *vmw_kms_f
DRM_ERROR("Surface size cannot exceed %dx%d",
dev_priv->texture_max_width,
dev_priv->texture_max_height);
+ ret = -EINVAL;
goto err_out;
}
