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block: fix NULL pointer dereference in disk_report_zones() 

Commit 2284eec5053d ("block: introduce blkdev_get_zone_info()")
introduced the report_active field in struct blk_report_zones_args so
that open and closed zones can be reported with the condition
BLK_ZONE_COND_ACTIVE in the case of a cached report zone.
However, the args pointer to a struct blk_report_zones_args that is
passed to disk_report_zones() can be NULL, e.g. in the case of internal
report zones operations for device mapper zoned targets.

Fix disk_report_zones() to make sure to check that the args is not null
before updating a zone condition for cached zone reports.

Fixes: 2284eec5053d ("block: introduce blkdev_get_zone_info()")
Reported-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2025-11-13 22:40:27 +09:00 committed by Jens Axboe
parent c2b8d20628
commit 881880b6f3
1 changed files with 1 additions and 1 deletions
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2
block/blk-zoned.c
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@ -854,7 +854,7 @@ static unsigned int disk_zone_wplug_sync_wp_offset(struct gendisk *disk,
int disk_report_zone(struct gendisk *disk, struct blk_zone *zone,
unsigned int idx, struct blk_report_zones_args *args)
{
if (args->report_active) {
if (args && args->report_active) {
/*
* If we come here, then this is a report zones as a fallback
* for a cached report. So collapse the implicit open, explicit