[PATCH] scsi: cxgbi: add null check before pointer dereference

[Gustavo A. R. Silva]

Add null check before dereferencing pointer _sg_ inside sg_next()

Addresses-Coverity-ID: 1364845
Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
 drivers/scsi/cxgbi/libcxgbi.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index bd7d39e..6119ddf 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -1256,15 +1256,18 @@ void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
                *sg_off = offset;
        }
 
-       if (offset == len) {
-               offset = 0;
-               sg = sg_next(sg);
-               if (sg) {
-                       addr = sg_dma_address(sg);
-                       len = sg_dma_len(sg);
+       if (sg) {
+               if (offset == len) {
+                       offset = 0;
+                       sg = sg_next(sg);
+                       if (sg) {
+                               addr = sg_dma_address(sg);
+                               len = sg_dma_len(sg);
+                       }
                }
-       }
-       ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
+               ppod->addr[i] = cpu_to_be64(addr + offset);
+       } else
+               ppod->addr[i] = 0ULL;
 }
 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
 
-- 
2.5.0