[PATCH 28/64 v2] staging: lustre: uapi: check if argument for lustre_cfg_buf() is NULL

[James Simmons]

Check if lcfg passed in is NULL and if it is just return NULL.

Signed-off-by: James Simmons <uja.ornl@xxxxxxxxx>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6245
Reviewed-on: https://review.whamcloud.com/22138
Reviewed-by: Dmitry Eremin <dmitry.eremin@xxxxxxxxx>
Reviewed-by: Jinshan Xiong <jinshan.xiong@xxxxxxxxx>
Reviewed-by: Fan Yong <fan.yong@xxxxxxxxx>
Reviewed-by: Oleg Drokin <oleg.drokin@xxxxxxxxx>
Signed-off-by: James Simmons <jsimmons@xxxxxxxxxxxxx>
---
 drivers/staging/lustre/include/uapi/linux/lustre/lustre_cfg.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/lustre/include/uapi/linux/lustre/lustre_cfg.h b/drivers/staging/lustre/include/uapi/linux/lustre/lustre_cfg.h
index 4d23938..4208d61 100644
--- a/drivers/staging/lustre/include/uapi/linux/lustre/lustre_cfg.h
+++ b/drivers/staging/lustre/include/uapi/linux/lustre/lustre_cfg.h
@@ -161,6 +161,9 @@ static inline void *lustre_cfg_buf(struct lustre_cfg *lcfg, __u32 index)
 	size_t offset;
 	__u32 bufcount;
 
+	if (!lcfg)
+		return NULL;
+
 	bufcount = lcfg->lcfg_bufcount;
 	if (index >= bufcount)
 		return NULL;
-- 
1.8.3.1