3.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 23d3090f8b44ab42162e99e8584445bc25b8922f upstream.
The "i--" needs to happen at the start of the loop or it will try to
release something bogus (probably it will crash) and it won't release
the first ->vaddr_page[].
Fixes: 7b4eeed174b7 ('[media] vmalloc_sg: make sure all pages in vmalloc area are really DMA-ready')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/videobuf-dma-sg.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ b/drivers/media/v4l2-core/videobuf-dma-sg.c
@@ -253,9 +253,11 @@ int videobuf_dma_init_kernel(struct vide
return 0;
out_free_pages:
while (i > 0) {
- void *addr = page_address(dma->vaddr_pages[i]);
- dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]);
+ void *addr;
+
i--;
+ addr = page_address(dma->vaddr_pages[i]);
+ dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]);
}
kfree(dma->dma_addr);
dma->dma_addr = NULL;
--
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