From: Christoph Hellwig <hch@infradead.org>
To: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
linux-block <linux-block@vger.kernel.org>,
Damien Le Moal <Damien.LeMoal@wdc.com>,
Keith Busch <kbusch@kernel.org>,
"linux-scsi @ vger . kernel . org" <linux-scsi@vger.kernel.org>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
"linux-fsdevel @ vger . kernel . org"
<linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH v6 01/11] scsi: free sgtables in case command setup fails
Date: Thu, 16 Apr 2020 05:40:11 -0700 [thread overview]
Message-ID: <20200416124011.GA23647@infradead.org> (raw)
In-Reply-To: <20200415090513.5133-2-johannes.thumshirn@wdc.com>
On Wed, Apr 15, 2020 at 06:05:03PM +0900, Johannes Thumshirn wrote:
> In case scsi_setup_fs_cmnd() fails we're not freeing the sgtables
> allocated by scsi_init_io(), thus we leak the allocated memory.
>
> So free the sgtables allocated by scsi_init_io() in case
> scsi_setup_fs_cmnd() fails.
>
> Technically scsi_setup_scsi_cmnd() does not suffer from this problem, as
> it can only fail if scsi_init_io() fails, so it does not have sgtables
> allocated. But to maintain symmetry and as a measure of defensive
> programming, free the sgtables on scsi_setup_scsi_cmnd() failure as well.
> scsi_mq_free_sgtables() has safeguards against double-freeing of memory so
> this is safe to do.
>
> While we're at it, rename scsi_mq_free_sgtables() to scsi_free_sgtables().
Looks good,
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2020-04-16 12:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 9:05 [PATCH v6 00/11] Introduce Zone Append for writing to zoned block devices Johannes Thumshirn
2020-04-15 9:05 ` [PATCH v6 01/11] scsi: free sgtables in case command setup fails Johannes Thumshirn
2020-04-16 12:40 ` Christoph Hellwig [this message]
2020-04-16 16:27 ` Daniel Wagner
2020-04-15 9:05 ` [PATCH v6 02/11] block: provide fallbacks for blk_queue_zone_is_seq and blk_queue_zone_no Johannes Thumshirn
2020-04-16 17:22 ` Daniel Wagner
2020-04-15 9:05 ` [PATCH v6 03/11] block: rename __bio_add_pc_page to bio_add_hw_page Johannes Thumshirn
2020-04-16 18:17 ` Daniel Wagner
2020-04-15 9:05 ` [PATCH v6 04/11] block: Introduce REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-04-16 12:47 ` Christoph Hellwig
2020-04-17 7:42 ` Daniel Wagner
2020-04-17 8:42 ` Johannes Thumshirn
2020-04-17 12:07 ` Daniel Wagner
2020-04-15 9:05 ` [PATCH v6 05/11] block: introduce blk_req_zone_write_trylock Johannes Thumshirn
2020-04-15 9:05 ` [PATCH v6 06/11] block: Modify revalidate zones Johannes Thumshirn
2020-04-16 12:41 ` Christoph Hellwig
2020-04-15 9:05 ` [PATCH v6 07/11] scsi: sd_zbc: factor out sanity checks for zoned commands Johannes Thumshirn
2020-04-15 9:05 ` [PATCH v6 08/11] scsi: sd_zbc: emulate ZONE_APPEND commands Johannes Thumshirn
2020-04-16 12:43 ` Christoph Hellwig
2020-04-15 9:05 ` [PATCH v6 09/11] null_blk: Support REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-04-15 9:05 ` [PATCH v6 10/11] block: export bio_release_pages and bio_iov_iter_get_pages Johannes Thumshirn
2020-04-15 9:05 ` [PATCH v6 11/11] zonefs: use REQ_OP_ZONE_APPEND for sync DIO Johannes Thumshirn
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