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bcachefs: Fix possible null deref on mount

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Ensure that the block device pointer in a superblock handle is not
null before dereferencing it in bch2_dev_to_fs. The block device pointer
may be null when mounting a new bcachefs filesystem given another mounted
bcachefs filesystem exists that has at least one device that is offline.

Signed-off-by: Dan Robertson <dan@dlrobertson.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Dan Robertson
2021-05-12 14:07:57 -04:00
committed by Kent Overstreet
parent baf056b87d
commit ec4ab9d2fc
1 changed files with 1 additions and 1 deletions
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fs/bcachefs/super.c
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@@ -117,7 +117,7 @@ struct bch_fs *bch2_dev_to_fs(dev_t dev)
list_for_each_entry(c, &bch_fs_list, list)
for_each_member_device_rcu(ca, c, i, NULL)
if (ca->disk_sb.bdev->bd_dev == dev) {
if (ca->disk_sb.bdev && ca->disk_sb.bdev->bd_dev == dev) {
closure_get(&c->cl);
goto found;
}