[SCSI] libiscsi_tcp: fix max_r2t manipulation

Problem description from Xi Wang:
A large max_r2t could lead to integer overflow in subsequent call to
iscsi_tcp_r2tpool_alloc(), allocating a smaller buffer than expected
and leading to out-of-bounds write.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 00592e3bb375..8582d7c25732 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -3201,7 +3201,7 @@ int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
                 sscanf(buf, "%d", &session->initial_r2t_en);
                 break;
         case ISCSI_PARAM_MAX_R2T:
-                sscanf(buf, "%d", &session->max_r2t);
+                sscanf(buf, "%hu", &session->max_r2t);
                 break;
         case ISCSI_PARAM_IMM_DATA_EN:
                 sscanf(buf, "%d", &session->imm_data_en);