Commit 66ac9fe7 authored by David Sterba's avatar David Sterba

btrfs: add check to sysfs handler of label

Add a sanity check for the fs_info as we will dereference it, similar to
what the 'store features' handler does.
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent ee611138
...@@ -377,6 +377,9 @@ static ssize_t btrfs_label_store(struct kobject *kobj, ...@@ -377,6 +377,9 @@ static ssize_t btrfs_label_store(struct kobject *kobj,
struct btrfs_fs_info *fs_info = to_fs_info(kobj); struct btrfs_fs_info *fs_info = to_fs_info(kobj);
size_t p_len; size_t p_len;
if (!fs_info)
return -EPERM;
if (fs_info->sb->s_flags & MS_RDONLY) if (fs_info->sb->s_flags & MS_RDONLY)
return -EROFS; return -EROFS;
......
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