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From: Damien Le Moal <damien.lemoal@wdc.com>
To: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, linux-ide@vger.kernel.org,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	linux-scsi@vger.kernel.org
Cc: Sathya Prakash <sathya.prakash@broadcom.com>,
	Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
	Suganath Prabu Subramani  <suganath-prabu.subramani@broadcom.com>
Subject: [PATCH v4 02/10] libata: fix ata_host_start()
Date: Sat,  7 Aug 2021 13:18:51 +0900	[thread overview]
Message-ID: <20210807041859.579409-3-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20210807041859.579409-1-damien.lemoal@wdc.com>

The loop on entry of ata_host_start() may not initialize host->ops to a
non NULL value. The test on the host_stop field of host->ops must then
be preceded by a check that host->ops is not NULL.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
 drivers/ata/libata-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b17e161c07e2..01cbf45f9d02 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5579,7 +5579,7 @@ int ata_host_start(struct ata_host *host)
 			have_stop = 1;
 	}
 
-	if (host->ops->host_stop)
+	if (host->ops && host->ops->host_stop)
 		have_stop = 1;
 
 	if (have_stop) {
-- 
2.31.1


  parent reply	other threads:[~2021-08-07  4:19 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-07  4:18 [PATCH v4 00/10] libata cleanups and improvements Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 01/10] libata: fix ata_host_alloc_pinfo() Damien Le Moal
2021-08-09  6:09   ` Hannes Reinecke
2021-08-09  9:07     ` Damien Le Moal
2021-08-07  4:18 ` Damien Le Moal [this message]
2021-08-07  4:18 ` [PATCH v4 03/10] libata: fix sparse warning Damien Le Moal
2021-08-09  6:10   ` Hannes Reinecke
2021-08-07  4:18 ` [PATCH v4 04/10] libata: cleanup device sleep capability detection Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 05/10] libata: cleanup ata_dev_configure() Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 06/10] libata: cleanup NCQ priority handling Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 07/10] libata: fix ata_read_log_page() warning Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 08/10] libata: print feature list on device scan Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 09/10] libahci: Introduce ncq_prio_supported sysfs sttribute Damien Le Moal
2021-08-09  6:11   ` Hannes Reinecke
2021-08-07  4:18 ` [PATCH v4 10/10] scsi: mpt3sas: Introduce sas_ncq_prio_supported " Damien Le Moal
2021-08-10  3:12   ` Martin K. Petersen

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