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drm/vmwgfx: Handle surface check failure correctly

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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@yandex-team.ru>
Cc: stable@vger.kernel.org
Fixes: 810b3e1683 ("drm/vmwgfx: Support topology greater than texture size")
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241002122429.1981822-1-kniv@yandex-team.ru
This commit is contained in:
Nikolay Kuratov 2024-10-02 15:24:29 +03:00 committed by Zack Rusin
parent 512a9721ca
commit 26498b8d54
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@ -1510,6 +1510,7 @@ 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;
}