[PATCH v1] drm/amd/display: Have risk for memory exhaustion

[LongJun Tang]

In dcn*_clock_source_create when dcn*_clk_src_construct fails allocated
clk_src needs release. A local attack could use this to cause memory
exhaustion.

Signed-off-by: LongJun Tang <tanglong...@kylinos.cn>
---
 drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c   | 1 +
 drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c | 1 +
 drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c | 1 +
 drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c | 1 +
 drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c   | 1 +
 drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c | 1 +
 drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c   | 1 +
 drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c | 1 +
 8 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
index 020f512e9690..9b7e786bd4a2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
@@ -1323,6 +1323,7 @@ static struct clock_source *dcn30_clock_source_create(
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
index f04595b750ab..7c1225046544 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn301/dcn301_resource.c
@@ -1288,6 +1288,7 @@ static struct clock_source *dcn301_clock_source_create(
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
index b925b6ddde5a..73ae1146dad5 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn302/dcn302_resource.c
@@ -458,6 +458,7 @@ static struct clock_source 
*dcn302_clock_source_create(struct dc_context *ctx, s
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c
index 527d5c902878..0ea97eeec5a6 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn303/dcn303_resource.c
@@ -425,6 +425,7 @@ static struct clock_source 
*dcn303_clock_source_create(struct dc_context *ctx, s
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
index fddc21a5a04c..b02aa8874efb 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
@@ -1625,6 +1625,7 @@ static struct clock_source *dcn31_clock_source_create(
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c
index 58746c437554..b2ff29e5f93c 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c
@@ -1623,6 +1623,7 @@ static struct clock_source *dcn31_clock_source_create(
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
index a88dd7b3d1c1..71730b6666b0 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c
@@ -829,6 +829,7 @@ static struct clock_source *dcn32_clock_source_create(
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
diff --git a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c 
b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
index 61087f2385a9..d3980fc243c9 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn321/dcn321_resource.c
@@ -828,6 +828,7 @@ static struct clock_source *dcn321_clock_source_create(
                return &clk_src->base;
        }
 
+       kfree(clk_src);
        BREAK_TO_DEBUGGER();
        return NULL;
 }
-- 
2.17.1


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