From b0055acaedf56a2717a6e2a4b700f1959a1b60df Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Tue, 2 Apr 2019 12:58:11 -0700 Subject: scsi: target/iscsi: Detect conn_cmd_list corruption early Certain behavior of an initiator can cause the target driver to send both a reject and a SCSI response. If that happens two target_put_sess_cmd() calls will occur without the command having been removed from conn_cmd_list. In other words, conn_cmd_list will get corrupted once the freed memory is reused. Although the Linux kernel can detect list corruption if list debugging is enabled, in this case the context in which list corruption is detected is not related to the context that caused list corruption. Hence add WARN_ON() statements that report the context that is causing list corruption. Cc: Mike Christie Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Nicholas Bellinger Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- drivers/target/iscsi/iscsi_target_util.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/target') diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index 3ac494f63a0b..3da062ccd2ab 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -769,6 +769,8 @@ void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL; int rc; + WARN_ON(!list_empty(&cmd->i_conn_node)); + __iscsit_free_cmd(cmd, shutdown); if (se_cmd) { rc = transport_generic_free_cmd(se_cmd, shutdown); -- cgit v1.2.3-59-g8ed1b