From: Dan Carpenter <dan.carpenter@oracle.com>
To: Mauro Carvalho Chehab <m.chehab@samsung.com>,
James Harper <james.harper@ejbdigital.com.au>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Hans Verkuil <hverkuil@xs4all.nl>,
linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] [media] vmalloc_sg: off by one in error handling
Date: Tue, 05 Aug 2014 08:11:13 +0000 [thread overview]
Message-ID: <20140805081113.GB13605@mwanda> (raw)
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@oracle.com>
diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
index 3c8cc02..3ff15f1 100644
--- 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 videobuf_dmabuf *dma, int direction,
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;
reply other threads:[~2014-08-05 8:11 UTC|newest]
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