From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v5.16-rc1 commit 94f3cd7d832c28681f1dea54b4dd8606e5e2bc75 category: bugfix bugzilla: 188015, https://gitee.com/openeuler/kernel/issues/I6OERX CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=...
--------------------------------
disks_mutex is intended to serialize md_alloc. Extended it to also cover the kobject_uevent call and getting the sysfs dirent to help reducing error handling complexity.
Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Song Liu songliubraving@fb.com Signed-off-by: Jens Axboe axboe@kernel.dk
Conflict: drivers/md/md.c
Signed-off-by: Li Nan linan122@huawei.com Reviewed-by: Hou Tao houtao1@huawei.com Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com --- drivers/md/md.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c index 5f784b4e27a3..5a5e1f1fdb52 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5536,12 +5536,12 @@ static int md_alloc(dev_t dev, char *name) sysfs_create_group(&mddev->kobj, &md_bitmap_group)) pr_debug("pointless warning\n"); abort: - mutex_unlock(&disks_mutex); if (!error && mddev->kobj.sd) { kobject_uevent(&mddev->kobj, KOBJ_ADD); mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); mddev->sysfs_level = sysfs_get_dirent_safe(mddev->kobj.sd, "level"); } + mutex_unlock(&disks_mutex); mddev_put(mddev); return error; }