Am 24.06.21 um 19:47 schrieb Jason Ekstrand:
Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we weren't calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we weren't freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path.Signed-off-by: Jason Ekstrand <ja...@jlekstrand.net> Fixes: a02b9dc90d84 ("dma-buf/sync_file: refactor fence storage in struct sync_file") Cc: Gustavo Padovan <gustavo.pado...@collabora.co.uk> Cc: Christian König <christian.koe...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
--- drivers/dma-buf/sync_file.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c index 20d9bddbb985b..394e6e1e96860 100644 --- a/drivers/dma-buf/sync_file.c +++ b/drivers/dma-buf/sync_file.c @@ -211,8 +211,8 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a, struct sync_file *b) { struct sync_file *sync_file; - struct dma_fence **fences, **nfences, **a_fences, **b_fences; - int i, i_a, i_b, num_fences, a_num_fences, b_num_fences; + struct dma_fence **fences = NULL, **nfences, **a_fences, **b_fences; + int i = 0, i_a, i_b, num_fences, a_num_fences, b_num_fences;sync_file = sync_file_alloc();if (!sync_file) @@ -236,7 +236,7 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a, * If a sync_file can only be created with sync_file_merge * and sync_file_create, this is a reasonable assumption. */ - for (i = i_a = i_b = 0; i_a < a_num_fences && i_b < b_num_fences; ) { + for (i_a = i_b = 0; i_a < a_num_fences && i_b < b_num_fences; ) { struct dma_fence *pt_a = a_fences[i_a]; struct dma_fence *pt_b = b_fences[i_b];@@ -277,15 +277,16 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,fences = nfences; }- if (sync_file_set_fence(sync_file, fences, i) < 0) {- kfree(fences); + if (sync_file_set_fence(sync_file, fences, i) < 0) goto err; - }strlcpy(sync_file->user_name, name, sizeof(sync_file->user_name));return sync_file;err:+ while (i) + dma_fence_put(fences[--i]); + kfree(fences); fput(sync_file->file); return NULL;
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