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| author | Joe Moriarty <joe.moriarty@oracle.com> | 2018-02-12 22:51:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-24 08:59:07 +0300 |
| commit | 99d85c48b41944fc5f8a128f8254bcdf86b43df8 (patch) | |
| tree | f416af3d4c851d826f430bc57276957dbb20790a /drivers/gpu | |
| parent | ae6833f4c24289c14ba3f862409179b1936bff44 (diff) | |
| download | linux-99d85c48b41944fc5f8a128f8254bcdf86b43df8.tar.xz | |
drm: NULL pointer dereference [null-pointer-deref] (CWE 476) problem
commit 22a07038c0eaf4d1315a493ce66dcd255accba19 upstream.
The Parfait (version 2.1.0) static code analysis tool found the
following NULL pointer derefernce problem.
- drivers/gpu/drm/drm_dp_mst_topology.c
The call to drm_dp_calculate_rad() in function drm_dp_port_setup_pdt()
could result in a NULL pointer being returned to port->mstb due to a
failure to allocate memory for port->mstb.
Signed-off-by: Joe Moriarty <joe.moriarty@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180212195144.98323-3-joe.moriarty@oracle.com
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 8dbcb498d56c..41e67e983a7f 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1041,10 +1041,12 @@ static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) lct = drm_dp_calculate_rad(port, rad); port->mstb = drm_dp_add_mst_branch_device(lct, rad); - port->mstb->mgr = port->mgr; - port->mstb->port_parent = port; + if (port->mstb) { + port->mstb->mgr = port->mgr; + port->mstb->port_parent = port; - send_link = true; + send_link = true; + } break; } return send_link; |