linux-kernel - [PATCH 5.18 0076/1095] drm/shmem-helper: Add missing vunmap on error

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Message-Id: <20220815180432.679327225@linuxfoundation.org>
Date:   Mon, 15 Aug 2022 19:51:15 +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,
        Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 5.18 0076/1095] drm/shmem-helper: Add missing vunmap on error

From: Dmitry Osipenko <dmitry.osipenko@...labora.com>

commit df4aaf015775221dde8a51ee09edb919981f091e upstream.

The vmapping of dma-buf may succeed, but DRM SHMEM rejects the IOMEM
mapping, and thus, drm_gem_shmem_vmap_locked() should unvmap the IOMEM
before erroring out.

Cc: stable@...r.kernel.org
Fixes: 49a3f51dfeee ("drm/gem: Use struct dma_buf_map in GEM vmap ops and convert GEM backends")
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630200058.1883506-2-dmitry.osipenko@collabora.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -302,6 +302,7 @@ static int drm_gem_shmem_vmap_locked(str
 		ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
 		if (!ret) {
 			if (WARN_ON(map->is_iomem)) {
+				dma_buf_vunmap(obj->import_attach->dmabuf, map);
 				ret = -EIO;
 				goto err_put_pages;
 			}