Re: [syzbot] KASAN: use-after-free Read in disk_part_iter_next (2)
From: Christoph Hellwig <hch@lst.de>
Date: 2021-03-22 07:18:59
Also in:
lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
I've been running the reproducer on a KASAN enable VM for about 15 minutes now, but haven't been able to reproduce it. Is there a way to inject this proposed fix into the syzbot queue?
diff --git a/block/partitions/core.c b/block/partitions/core.c
index 1a7558917c47d6..f5d5872b89d57e 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c@@ -288,15 +288,12 @@ struct device_type part_type = { void delete_partition(struct block_device *part) { xa_erase(&part->bd_disk->part_tbl, part->bd_partno); - kobject_put(part->bd_holder_dir); - device_del(&part->bd_device); - - /* - * Remove the block device from the inode hash, so that it cannot be - * looked up any more even when openers still hold references. - */ remove_inode_hash(part->bd_inode); + synchronize_rcu(); + + kobject_put(part->bd_holder_dir); + device_del(&part->bd_device); put_device(&part->bd_device); }