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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
        Hannes Reinecke <hare@suse.com>,
        "Ewan D. Milne" <emilne@redhat.com>,
        Ming Lei <ming.lei@redhat.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Subject: [PATCH 4.19 168/271] scsi: core: Fix race on creating sense cache
Date:   Wed, 24 Jul 2019 21:20:37 +0200
Message-Id: <20190724191709.569951829@linuxfoundation.org>
In-Reply-To: <20190724191655.268628197@linuxfoundation.org>
References: <20190724191655.268628197@linuxfoundation.org>
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From: Ming Lei <ming.lei@redhat.com>

commit f9b0530fa02e0c73f31a49ef743e8f44eb8e32cc upstream.

When scsi_init_sense_cache(host) is called concurrently from different
hosts, each code path may find that no cache has been created and
allocate a new one. The lack of locking can lead to potentially
overriding a cache allocated by a different host.

Fix the issue by moving 'mutex_lock(&scsi_sense_cache_mutex)' before
scsi_select_sense_cache().

Fixes: 0a6ac4ee7c21 ("scsi: respect unchecked_isa_dma for blk-mq")
Cc: Stable <stable@vger.kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/scsi/scsi_lib.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -71,11 +71,11 @@ int scsi_init_sense_cache(struct Scsi_Ho
 	struct kmem_cache *cache;
 	int ret = 0;
 
+	mutex_lock(&scsi_sense_cache_mutex);
 	cache = scsi_select_sense_cache(shost->unchecked_isa_dma);
 	if (cache)
-		return 0;
+		goto exit;
 
-	mutex_lock(&scsi_sense_cache_mutex);
 	if (shost->unchecked_isa_dma) {
 		scsi_sense_isadma_cache =
 			kmem_cache_create("scsi_sense_cache(DMA)",
@@ -91,7 +91,7 @@ int scsi_init_sense_cache(struct Scsi_Ho
 		if (!scsi_sense_cache)
 			ret = -ENOMEM;
 	}
-
+ exit:
 	mutex_unlock(&scsi_sense_cache_mutex);
 	return ret;
 }