I don't have drm-misc access. Mind pushing?
On Thu, Jun 24, 2021 at 12:59 PM Christian König
<christian.koenig@xxxxxxx> wrote:
>
> 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 <jason@xxxxxxxxxxxxxx>
> > Fixes: a02b9dc90d84 ("dma-buf/sync_file: refactor fence storage in struct sync_file")
> > Cc: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
> > Cc: Christian König <christian.koenig@xxxxxxx>
>
> Reviewed-by: Christian König <christian.koenig@xxxxxxx>
>
> > ---
> > 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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