diff options
| author | Dan Robertson <dan@dlrobertson.com> | 2021-05-12 14:07:57 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@gmail.com> | 2021-05-19 15:33:47 -0400 |
| commit | 7c3024e977443be5543eea1d8e0b7c0b58ae150e (patch) | |
| tree | 8b705dddf6007118755951bcde58524177ac5d3e | |
| parent | 07f721aa0e0fadd6db074b3abab113a36849b309 (diff) | |
bcachefs: Fix possible null deref on mount
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>
| -rw-r--r-- | fs/bcachefs/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/bcachefs/super.c b/fs/bcachefs/super.c index e5936041b9e2..3b1e9203bfcc 100644 --- a/fs/bcachefs/super.c +++ b/fs/bcachefs/super.c @@ -110,7 +110,7 @@ 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; } |