hal: go from head of usecase list after removing offload usecase during ssr

When SSR is happening and the sound card is offline, after removing
an offload usecase from the usecase list, start traversing from the
beginning of the list on the next iteration. This must be done
because in the process of removing the current node from the list,
there is a moment in the time where another thread can remove the
node immediately after it which is also pointed to by tempnode
that is used by list_for_each_safe. This would result in tempnode
pointing to invalid memory on the next iteration of list_for_each_safe,
causing a segfault.

CRs-Fixed: 1088561
Change-Id: I8a220afa341c4e62612a809064754ddcd497d88a

1 files changed, 1 insertions, 0 deletions

diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 1ea67542..40aea9af 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -4308,6 +4308,7 @@ static void close_compress_sessions(struct audio_device *adev)
                 pthread_mutex_unlock(&adev->lock);
                 out_standby(&out->stream.common);
                 pthread_mutex_lock(&adev->lock);
+                tempnode = list_head(&adev->usecase_list);
             }
        }
     }