[media] mantis: Fix error handling in mantis_dma_init()

Current code assigns 0 to variable 'err', which makes mantis_dma_init()
to return success even if mantis_alloc_buffers() fails.

Fix it by checking the return value from mantis_alloc_buffers() and
propagating it in the case of error.

Reported-by: RUC_Soft_Sec <zy900702@163.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/media/pci/mantis/mantis_dma.c b/drivers/media/pci/mantis/mantis_dma.c
index 1d59c7e039f7..87990ece5848 100644
--- a/drivers/media/pci/mantis/mantis_dma.c
+++ b/drivers/media/pci/mantis/mantis_dma.c
@@ -130,10 +130,11 @@ err:
 
 int mantis_dma_init(struct mantis_pci *mantis)
 {
-        int err = 0;
+        int err;
 
         dprintk(MANTIS_DEBUG, 1, "Mantis DMA init");
-        if (mantis_alloc_buffers(mantis) < 0) {
+        err = mantis_alloc_buffers(mantis);
+        if (err < 0) {
                 dprintk(MANTIS_ERROR, 1, "Error allocating DMA buffer");
 
                 /* Stop RISC Engine */