From: Christoph Hellwig <hch@lst.de> mainline inclusion from block-5.15 commit 783a40a1b3ac7f3714d2776fa8ac8cce3535e4f6 category: bugfix bugzilla: 181328 CVE: NA ----------------------------------------------- While clearing the profile itself is harmless, we really should not clear the stable writes flag if it wasn't set due to a registered integrity profile. Reported-by: Lihong Kou <koulihong@huawei.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Link: https://lore.kernel.org/r/20210914070657.87677-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Hou Tao <houtao1@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- block/blk-integrity.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/blk-integrity.c b/block/blk-integrity.c index 6121611e13164..0638f4868f705 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -431,8 +431,13 @@ EXPORT_SYMBOL(blk_integrity_register); */ void blk_integrity_unregister(struct gendisk *disk) { + struct blk_integrity *bi = &disk->queue->integrity; + + if (!bi->profile) + return; + disk->queue->backing_dev_info->capabilities &= ~BDI_CAP_STABLE_WRITES; - memset(&disk->queue->integrity, 0, sizeof(struct blk_integrity)); + memset(bi, 0, sizeof(*bi)); } EXPORT_SYMBOL(blk_integrity_unregister); -- 2.25.1