[PATCH 024/115] gpu: ion: Only map as much of the vma as the user requested

[John Stultz]

From: Rebecca Schultz Zavin <rebecca@xxxxxxxxxxx>

Signed-off-by: Rebecca Schultz Zavin <rebecca@xxxxxxxxxxx>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
 drivers/staging/android/ion/ion_system_heap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index 3f607df..7397bc4 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -192,6 +192,8 @@ int ion_system_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
 		remap_pfn_range(vma, addr, page_to_pfn(sg_page(sg)),
 				sg_dma_len(sg), vma->vm_page_prot);
 		addr += sg_dma_len(sg);
+		if (addr >= vma->vm_end)
+			return 0;
 	}
 	return 0;
 }
-- 
1.8.3.2

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