From: Josip Pavic <Josip.Pavic@xxxxxxx>
commit be73e608ae2711dc8a1ab8b9549d9e348061b2ee upstream.
[Why]
Failing to allocate a transfer function during stream construction leads
to a null pointer dereference
[How]
Handle the failed allocation by failing the stream construction
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Josip Pavic <Josip.Pavic@xxxxxxx>
Reviewed-by: Aric Cyr <Aric.Cyr@xxxxxxx>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -56,7 +56,7 @@ void update_stream_signal(struct dc_stre
}
}
-static void dc_stream_construct(struct dc_stream_state *stream,
+static bool dc_stream_construct(struct dc_stream_state *stream,
struct dc_sink *dc_sink_data)
{
uint32_t i = 0;
@@ -118,11 +118,17 @@ static void dc_stream_construct(struct d
update_stream_signal(stream, dc_sink_data);
stream->out_transfer_func = dc_create_transfer_func();
+ if (stream->out_transfer_func == NULL) {
+ dc_sink_release(dc_sink_data);
+ return false;
+ }
stream->out_transfer_func->type = TF_TYPE_BYPASS;
stream->out_transfer_func->ctx = stream->ctx;
stream->stream_id = stream->ctx->dc_stream_id_count;
stream->ctx->dc_stream_id_count++;
+
+ return true;
}
static void dc_stream_destruct(struct dc_stream_state *stream)
@@ -164,13 +170,20 @@ struct dc_stream_state *dc_create_stream
stream = kzalloc(sizeof(struct dc_stream_state), GFP_KERNEL);
if (stream == NULL)
- return NULL;
+ goto alloc_fail;
- dc_stream_construct(stream, sink);
+ if (dc_stream_construct(stream, sink) == false)
+ goto construct_fail;
kref_init(&stream->refcount);
return stream;
+
+construct_fail:
+ kfree(stream);
+
+alloc_fail:
+ return NULL;
}
struct dc_stream_state *dc_copy_stream(const struct dc_stream_state *stream)
