6.6-stable review patch. If anyone has any objections, please let me know.
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From: Haotian Zhang vulab@iscas.ac.cn
commit 94de23a9aa487d7c1372efb161721d7949a177ae upstream.
In vb2_dc_alloc(), get_device() is called to increment the device reference count. However, if subsequent DMA allocation fails (vb2_dc_alloc_coherent or vb2_dc_alloc_non_coherent returns error), the function returns without calling put_device(), causing a device reference leak.
Add put_device() call in the error path before kfree() to properly release the device reference acquired earlier.
Fixes: de27891f675e ("media: videobuf2: handle non-contiguous DMA allocations") Cc: stable@vger.kernel.org Signed-off-by: Haotian Zhang vulab@iscas.ac.cn Reviewed-by: Marek Szyprowski m.szyprowski@samsung.com Signed-off-by: Hans Verkuil hverkuil+cisco@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/media/common/videobuf2/videobuf2-dma-contig.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c @@ -258,6 +258,7 @@ static void *vb2_dc_alloc(struct vb2_buf
if (ret) { dev_err(dev, "dma alloc of size %lu failed\n", size); + put_device(buf->dev); kfree(buf); return ERR_PTR(-ENOMEM); }