[PATCH 06/46] drm/amd/display: Skip finding free audio for unknown engine_id

[Wayne Lin]

From: Alex Hung <alex.h...@amd.com>

[WHY]
ENGINE_ID_UNKNOWN = -1 and can not be used as an array index. Plus, it
also means it is uninitialized and does not need free audio.

[HOW]
Skip and return NULL.

This fixes 2 OVERRUN issues reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.sique...@amd.com>
Acked-by: Wayne Lin <wayne....@amd.com>
Signed-off-by: Alex Hung <alex.h...@amd.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c 
b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index fa93d6d6563d..93f05e2080f4 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -3230,6 +3230,9 @@ static struct audio *find_first_free_audio(
 {
        int i, available_audio_count;
 
+       if (id == ENGINE_ID_UNKNOWN)
+               return NULL;
+
        available_audio_count = pool->audio_count;
 
        for (i = 0; i < available_audio_count; i++) {
-- 
2.37.3