From: Tetsuo Handa penguin-kernel@i-love.sakura.ne.jp
mainline inclusion from mainline-v5.17-rc1 commit e338924bd05d6e71574bc13e310c89e10e49a8a5 category: bugfix bugzilla: 188733, https://gitee.com/openeuler/kernel/issues/I81XCK
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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ioctl(fd, LOOP_CTL_ADD, 1048576) causes
sysfs: cannot create duplicate filename '/dev/block/7:0'
message because such request is treated as if ioctl(fd, LOOP_CTL_ADD, 0) due to MINORMASK == 1048575. Verify that all minor numbers for that device fit in the minor range.
Reported-by: wangyangbo wangyangbo@uniontech.com Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/b1b19379-23ee-5379-0eb5-94bf5f79f1b4@i-love.sakura... Signed-off-by: Jens Axboe axboe@kernel.dk conflict: block/genhd.c Signed-off-by: Zhong Jinghua zhongjinghua@huawei.com --- block/genhd.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/block/genhd.c b/block/genhd.c index bfbc61be3ddd..1f2940cbb68e 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -795,6 +795,9 @@ static int __device_add_disk(struct device *parent, struct gendisk *disk, WARN_ON(!disk->minors && !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN)));
+ if (disk->minors != 0 && + disk->first_minor + disk->minors > MINORMASK + 1) + goto out_exit_elevator; retval = blk_alloc_devt(&disk->part0, &devt); if (retval) goto out_exit_elevator;