linux-kernel - [PATCH 4.19 33/37] scsi: core: Fix shost->cmd_per_lun calculation in scsi_add_host_with

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Message-Id: <20211025190935.016115642@linuxfoundation.org>
Date:   Mon, 25 Oct 2021 21:14:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Haiyang Zhang <haiyangz@...rosoft.com>,
        Ming Lei <ming.lei@...hat.com>,
        John Garry <john.garry@...wei.com>,
        Dexuan Cui <decui@...rosoft.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.19 33/37] scsi: core: Fix shost->cmd_per_lun calculation in scsi_add_host_with_dma()

From: Dexuan Cui <decui@...rosoft.com>

commit 50b6cb3516365cb69753b006be2b61c966b70588 upstream.

After commit ea2f0f77538c ("scsi: core: Cap scsi_host cmd_per_lun at
can_queue"), a 416-CPU VM running on Hyper-V hangs during boot because the
hv_storvsc driver sets scsi_driver.can_queue to an integer value that
exceeds SHRT_MAX, and hence scsi_add_host_with_dma() sets
shost->cmd_per_lun to a negative "short" value.

Use min_t(int, ...) to work around the issue.

Link: https://lore.kernel.org/r/20211008043546.6006-1-decui@microsoft.com
Fixes: ea2f0f77538c ("scsi: core: Cap scsi_host cmd_per_lun at can_queue")
Cc: stable@...r.kernel.org
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
Reviewed-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: John Garry <john.garry@...wei.com>
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/scsi/hosts.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -218,7 +218,8 @@ int scsi_add_host_with_dma(struct Scsi_H
 		goto fail;
 	}
 
-	shost->cmd_per_lun = min_t(short, shost->cmd_per_lun,
+	/* Use min_t(int, ...) in case shost->can_queue exceeds SHRT_MAX */
+	shost->cmd_per_lun = min_t(int, shost->cmd_per_lun,
 				   shost->can_queue);
 
 	error = scsi_init_sense_cache(shost);