[PATCH] scsi_debug: num_tgts must be >= 0

[Maurizio Lombardi <mlombard@xxxxxxxxxx>]

Passing the parameter "num_tgts=-1" will start
an infinite loop that exhausts the system memory

Signed-off-by: Maurizio Lombardi <mlombard@xxxxxxxxxx>
---
 drivers/scsi/scsi_debug.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index d323523f5f9d..32965ec76965 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -5263,6 +5263,11 @@ static int __init scsi_debug_init(void)
 		return -EINVAL;
 	}
 
+	if (sdebug_num_tgts < 0) {
+		pr_err("num_tgts must be >= 0\n");
+		return -EINVAL;
+	}
+
 	if (sdebug_guard > 1) {
 		pr_err("guard must be 0 or 1\n");
 		return -EINVAL;
-- 
Maurizio Lombardi