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staging: ion: Prevent incorrect reference counting behavour
Supply additional check in order to prevent unexpected results.
Fixes: b892bf75b2
("ion: Switch ion to use dma-buf")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 3 additions and 0 deletions
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@ -140,6 +140,9 @@ static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
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void *vaddr;
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if (buffer->kmap_cnt) {
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if (buffer->kmap_cnt == INT_MAX)
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return ERR_PTR(-EOVERFLOW);
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buffer->kmap_cnt++;
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return buffer->vaddr;
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}
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