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Message-Id: <20211216181443.38155-1-jose.exposito89@gmail.com>
Date: Thu, 16 Dec 2021 19:14:43 +0100
From: José Expósito <jose.exposito89@...il.com>
To: harry.wentland@....com
Cc: sunpeng.li@....com, Rodrigo.Siqueira@....com,
alexander.deucher@....com, christian.koenig@....com,
Xinhui.Pan@....com, airlied@...ux.ie, charlene.liu@....com,
amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
José Expósito <jose.exposito89@...il.com>
Subject: [PATCH] drm/amd/display: fix dereference before NULL check
The "plane_state" pointer was access before checking if it was NULL.
Avoid a possible NULL pointer dereference by accessing the plane
address after the check.
Addresses-Coverity-ID: 1474582 ("Dereference before null check")
Fixes: 3f68c01be9a22 ("drm/amd/display: add cyan_skillfish display support")
Signed-off-by: José Expósito <jose.exposito89@...il.com>
---
drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c
index cfd09b3f705e..fe22530242d2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn201/dcn201_hwseq.c
@@ -134,11 +134,12 @@ void dcn201_update_plane_addr(const struct dc *dc, struct pipe_ctx *pipe_ctx)
PHYSICAL_ADDRESS_LOC addr;
struct dc_plane_state *plane_state = pipe_ctx->plane_state;
struct dce_hwseq *hws = dc->hwseq;
- struct dc_plane_address uma = plane_state->address;
+ struct dc_plane_address uma;
if (plane_state == NULL)
return;
+ uma = plane_state->address;
addr_patched = patch_address_for_sbs_tb_stereo(pipe_ctx, &addr);
plane_address_in_gpu_space_to_uma(hws, &uma);
--
2.25.1
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