linux-kernel - [PATCH] scsi: fix crash in scsi_remove

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Date:   Mon, 17 Oct 2022 10:11:47 -0700
From:   Khazhismel Kumykov <khazhy@...omium.org>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     Gabriel Krisman Bertazi <krisman@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Khazhismel Kumykov <khazhy@...gle.com>
Subject: [PATCH] scsi: fix crash in scsi_remove_host after alloc failure

If transport_register_device returns error, shost_gendev has already
been cleaned up - however since we ignore the error device setup
continues happily. We will eventually call transport_unregister_device,
attempting to delete shost_gendev again, resulting in a crash.

It looks like when this cleanup behavior was added, iscsi was updated,
but scsi was missed.

Fixes: cd7ea70bb00a ("scsi: drivers: base: Propagate errors through the transport component")

Signed-off-by: Khazhismel Kumykov <khazhy@...gle.com>
---
 drivers/scsi/scsi_sysfs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index c95177ca6ed2..722ab042fbd7 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1599,7 +1599,11 @@ EXPORT_SYMBOL(scsi_register_interface);
  **/
 int scsi_sysfs_add_host(struct Scsi_Host *shost)
 {
-	transport_register_device(&shost->shost_gendev);
+	int err;
+
+	err = transport_register_device(&shost->shost_gendev);
+	if (err)
+		return err;
 	transport_configure_device(&shost->shost_gendev);
 	return 0;
 }
-- 
2.38.0.413.g74048e4d9e-goog