From: Johannes Thumshirn Date: Wed, 17 Feb 2021 13:52:45 +0000 (+0900) Subject: scsi: sd: sd_zbc: Don't pass GFP_NOIO to kvcalloc X-Git-Tag: v5.12-rc1~5^2~4 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9acced3f58ad24407c1f9ebf53a8892c1e24cdb5;p=thirdparty%2Fkernel%2Flinux.git scsi: sd: sd_zbc: Don't pass GFP_NOIO to kvcalloc Dan reported we're passing in GFP_NOIO to kvmalloc() which will then fallback to doing kmalloc() instead of an optional vmalloc() if the size exceeds kmalloc()s limits. This will break with drives that have zone numbers exceeding PAGE_SIZE/sizeof(u32). Instead of passing in GFP_NOIO, enter an implicit GFP_NOIO allocation scope. Link: https://lore.kernel.org/r/YCuvSfKw4qEQBr/t@mwanda Link: https://lore.kernel.org/r/5a6345e2989fd06c049ac4e4627f6acb492c15b8.1613569821.git.johannes.thumshirn@wdc.com Fixes: 5795eb443060: ("scsi: sd_zbc: emulate ZONE_APPEND commands") Cc: Damien Le Moal Reported-by: Dan Carpenter Reviewed-by: Damien Le Moal Signed-off-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c index cf07b7f935790..87a7274e4632b 100644 --- a/drivers/scsi/sd_zbc.c +++ b/drivers/scsi/sd_zbc.c @@ -688,6 +688,7 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp) unsigned int nr_zones = sdkp->rev_nr_zones; u32 max_append; int ret = 0; + unsigned int flags; /* * For all zoned disks, initialize zone append emulation data if not @@ -720,16 +721,19 @@ int sd_zbc_revalidate_zones(struct scsi_disk *sdkp) disk->queue->nr_zones == nr_zones) goto unlock; + flags = memalloc_noio_save(); sdkp->zone_blocks = zone_blocks; sdkp->nr_zones = nr_zones; - sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_NOIO); + sdkp->rev_wp_offset = kvcalloc(nr_zones, sizeof(u32), GFP_KERNEL); if (!sdkp->rev_wp_offset) { ret = -ENOMEM; + memalloc_noio_restore(flags); goto unlock; } ret = blk_revalidate_disk_zones(disk, sd_zbc_revalidate_zones_cb); + memalloc_noio_restore(flags); kvfree(sdkp->rev_wp_offset); sdkp->rev_wp_offset = NULL;