[PATCH 4/4] staging: lustre: Fix potential buffer underflow

[Hugues Morisset]

Signed-off-by: Hugues Morisset <morisset.hugues@xxxxxxxxx>
---
 drivers/staging/lustre/lustre/include/obd.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/include/obd.h b/drivers/staging/lustre/lustre/include/obd.h
index 409eae6..bb67e40 100644
--- a/drivers/staging/lustre/lustre/include/obd.h
+++ b/drivers/staging/lustre/lustre/include/obd.h
@@ -677,7 +677,12 @@ static inline int is_osp_on_mdt(char *name)
 	if (strncmp(ptr + 1, "MDT", 3) != 0)
 		return 0;
 
-	while (*(--ptr) != '-' && ptr != name);
+	if (ptr == name)
+		return 0;
+
+	--ptr;
+	while (ptr != '-' && ptr != name)
+		--ptr;
 
 	if (ptr == name)
 		return 0;
-- 
2.1.0


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