diff options
| author | Alisa Khabibrakhmanova <khabibrakhmanova@ispras.ru> | 2022-07-29 12:06:43 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2022-09-07 07:01:16 +0200 |
| commit | 5e1bfb277d3b87bc580735564eb487c0be3848b3 (patch) | |
| tree | 275f115a5aff9649fa1cd91e85feb2bb54cf3e0a | |
| parent | 07d50b8222d0d6fcbb281393048e36e797334ac6 (diff) | |
| download | linux-5e1bfb277d3b87bc580735564eb487c0be3848b3.tar.bz2 | |
drm/via: Add new condition to via_dma_cleanup()
Pointer dev_priv->mmio, which was checked for NULL at via_do_init_map(),
is passed to via_do_cleanup_map() and is dereferenced there without check.
The patch adds the condition in via_dma_cleanup() which prevents potential NULL
pointer dereference.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 22f579c621e2 ("drm: Add via unichrome support")
Signed-off-by: Alisa Khabibrakhmanova <khabibrakhmanova@ispras.ru>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220729090643.240778-1-khabibrakhmanova@ispras.ru
| -rw-r--r-- | drivers/gpu/drm/via/via_dri1.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/via/via_dri1.c b/drivers/gpu/drm/via/via_dri1.c index f659c0c0465c..217d1e84b0ea 100644 --- a/drivers/gpu/drm/via/via_dri1.c +++ b/drivers/gpu/drm/via/via_dri1.c @@ -2961,7 +2961,7 @@ int via_dma_cleanup(struct drm_device *dev) drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private; - if (dev_priv->ring.virtual_start) { + if (dev_priv->ring.virtual_start && dev_priv->mmio) { via_cmdbuf_reset(dev_priv); drm_legacy_ioremapfree(&dev_priv->ring.map, dev); |