| Message ID | 20190402195815.254796-8-bvanassche@acm.org (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | SCSI target patches for kernel v5.2 | expand |
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);
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 <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Bart Van Assche <bvanassche@acm.org> --- drivers/target/iscsi/iscsi_target_util.c | 2 ++ 1 file changed, 2 insertions(+)