diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/namespace.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 9a3c251d033d..23187a414754 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -5044,22 +5044,23 @@ static int statmount_string(struct kstatmount *s, u64 flag) size_t kbufsize; struct seq_file *seq = &s->seq; struct statmount *sm = &s->sm; + u32 start = seq->count; switch (flag) { case STATMOUNT_FS_TYPE: - sm->fs_type = seq->count; + sm->fs_type = start; ret = statmount_fs_type(s, seq); break; case STATMOUNT_MNT_ROOT: - sm->mnt_root = seq->count; + sm->mnt_root = start; ret = statmount_mnt_root(s, seq); break; case STATMOUNT_MNT_POINT: - sm->mnt_point = seq->count; + sm->mnt_point = start; ret = statmount_mnt_point(s, seq); break; case STATMOUNT_MNT_OPTS: - sm->mnt_opts = seq->count; + sm->mnt_opts = start; ret = statmount_mnt_opts(s, seq); break; default: @@ -5067,6 +5068,12 @@ static int statmount_string(struct kstatmount *s, u64 flag) return -EINVAL; } + /* + * If nothing was emitted, return to avoid setting the flag + * and terminating the buffer. + */ + if (seq->count == start) + return ret; if (unlikely(check_add_overflow(sizeof(*sm), seq->count, &kbufsize))) return -EOVERFLOW; if (kbufsize >= s->bufsize) |