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[2/3] btrfs: add check to sysfs handler of label

Message ID c473c6e1d1f9f7e0f2adf6d35bc4a479c1de059a.1461681045.git.dsterba@suse.com (mailing list archive)
State Accepted
Headers show

Commit Message

David Sterba April 26, 2016, 2:32 p.m. UTC 
Add a sanity check for the fs_info as we will dereference it, similar to
what the 'store features' handler does.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/sysfs.c | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 6a6bb600b1ff..3d14618ce54b 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -377,6 +377,9 @@  static ssize_t btrfs_label_store(struct kobject *kobj,
 	struct btrfs_fs_info *fs_info = to_fs_info(kobj);
 	size_t p_len;
 
+	if (!fs_info)
+		return -EPERM;
+
 	if (fs_info->sb->s_flags & MS_RDONLY)
 		return -EROFS;