[PATCH] scsi: mvumi: add check for dma mapping errors

[Alexey Khoroshilov]

mvumi_make_sgl() does not check if mapping dma memory succeed.

The patch adds return error code if the mapping failed and
if scsi_bufflen(scmd) is zero. The latter is just in case
since the only call site of mvumi_make_sgl() check the scsi_bufflen(scmd)
before the call.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
 drivers/scsi/mvumi.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
index 247df5e79b71..49f8b20f5d91 100644
--- a/drivers/scsi/mvumi.c
+++ b/drivers/scsi/mvumi.c
@@ -232,11 +232,14 @@ static int mvumi_make_sgl(struct mvumi_hba *mhba, struct 
scsi_cmnd *scmd,
                        sgd_inc(mhba, m_sg);
                }
        } else {
-               scmd->SCp.dma_handle = scsi_bufflen(scmd) ?
-                       pci_map_single(mhba->pdev, scsi_sglist(scmd),
-                               scsi_bufflen(scmd),
-                               (int) scmd->sc_data_direction)
-                       : 0;
+               if (!scsi_bufflen(scmd))
+                       return -1;
+               scmd->SCp.dma_handle = pci_map_single(mhba->pdev,
+                                               scsi_sglist(scmd),
+                                               scsi_bufflen(scmd),
+                                               (int) scmd->sc_data_direction);
+               if (pci_dma_mapping_error(mhba->pdev, scmd->SCp.dma_handle))
+                       return -1;
                busaddr = scmd->SCp.dma_handle;
                m_sg->baseaddr_l = cpu_to_le32(lower_32_bits(busaddr));
                m_sg->baseaddr_h = cpu_to_le32(upper_32_bits(busaddr));
-- 
2.7.4