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Petersen" Cc: Dongliang Mu Subject: [PATCH v3 2/2] scsi: sd_zbc: prevent zone information memory leak Date: Wed, 1 Jun 2022 15:25:44 +0900 Message-Id: <20220601062544.905141-3-damien.lemoal@opensource.wdc.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220601062544.905141-1-damien.lemoal@opensource.wdc.com> References: <20220601062544.905141-1-damien.lemoal@opensource.wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Make sure to always free a scsi disk zone information, even for regular disks. This ensures that there is no memory leak, even in the case of a zoned disk changing type to a regular disk (e.g. with a reformat using the FORMAT WITH PRESET command or other vendor proprietary command). To do this, rename sd_zbc_clear_zone_info() to sd_zbc_free_zone_info() and remove sd_zbc_release_disk(). A call to sd_zbc_free_zone_info() is added to sd_zbc_read_zones() for drives for which sd_is_zoned() returns false. Furthermore, sd_zbc_free_zone_info() code make s sure that the sdkp rev_mutex is never used while not being initialized by gating the cleanup code with a a check on the zone_wp_update_buf field as it is never NULL when rev_mutex has been initialized. Signed-off-by: Damien Le Moal Reviewed-by: Johannes Thumshirn Reviewed-by: Christoph Hellwig --- drivers/scsi/sd.c | 2 +- drivers/scsi/sd.h | 4 ++-- drivers/scsi/sd_zbc.c | 26 +++++++++++++------------- 3 files changed, 16 insertions(+), 16 deletions(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index dabdc0eeb3dc..be812987aa3f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3578,7 +3578,7 @@ static void scsi_disk_release(struct device *dev) struct scsi_disk *sdkp = to_scsi_disk(dev); ida_free(&sd_index_ida, sdkp->index); - sd_zbc_release_disk(sdkp); + sd_zbc_free_zone_info(sdkp); put_device(&sdkp->device->sdev_gendev); free_opal_dev(sdkp->opal_dev); diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 2abad54fd23f..5eea762f84d1 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -241,7 +241,7 @@ static inline int sd_is_zoned(struct scsi_disk *sdkp) #ifdef CONFIG_BLK_DEV_ZONED -void sd_zbc_release_disk(struct scsi_disk *sdkp); +void sd_zbc_free_zone_info(struct scsi_disk *sdkp); int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]); int sd_zbc_revalidate_zones(struct scsi_disk *sdkp); blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd, @@ -256,7 +256,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba, #else /* CONFIG_BLK_DEV_ZONED */ -static inline void sd_zbc_release_disk(struct scsi_disk *sdkp) {} +static inline void sd_zbc_free_zone_info(struct scsi_disk *sdkp) {} static inline int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]) { diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index 5b9fad70aa88..6acc4f406eb8 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -786,8 +786,11 @@ static int sd_zbc_init_disk(struct scsi_disk *sdkp) return 0; } -static void sd_zbc_clear_zone_info(struct scsi_disk *sdkp) +void sd_zbc_free_zone_info(struct scsi_disk *sdkp) { + if (!sdkp->zone_wp_update_buf) + return; + /* Serialize against revalidate zones */ mutex_lock(&sdkp->rev_mutex); @@ -802,12 +805,6 @@ static void sd_zbc_clear_zone_info(struct scsi_disk *sdkp) mutex_unlock(&sdkp->rev_mutex); } -void sd_zbc_release_disk(struct scsi_disk *sdkp) -{ - if (sd_is_zoned(sdkp)) - sd_zbc_clear_zone_info(sdkp); -} - static void sd_zbc_revalidate_zones_cb(struct gendisk *disk) { struct scsi_disk *sdkp = scsi_disk(disk); @@ -914,12 +911,15 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]) u32 zone_blocks = 0; int ret; - if (!sd_is_zoned(sdkp)) + if (!sd_is_zoned(sdkp)) { /* - * Device managed or normal SCSI disk, - * no special handling required + * Device managed or normal SCSI disk, no special handling + * required. Nevertheless, free the disk zone information in + * case the device type changed. */ + sd_zbc_free_zone_info(sdkp); return 0; + } /* READ16/WRITE16 is mandatory for ZBC disks */ sdkp->device->use_16_for_rw = 1; @@ -928,11 +928,11 @@ int sd_zbc_read_zones(struct scsi_disk *sdkp, u8 buf[SD_BUF_SIZE]) if (!blk_queue_is_zoned(q)) { /* * This can happen for a host aware disk with partitions. - * The block device zone information was already cleared - * by blk_queue_set_zoned(). Only clear the scsi disk zone + * The block device zone model was already cleared by + * blk_queue_set_zoned(). Only free the scsi disk zone * information and exit early. */ - sd_zbc_clear_zone_info(sdkp); + sd_zbc_free_zone_info(sdkp); return 0; }