diff options
| -rw-r--r-- | hw/9pfs/virtio-9p.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c index b5fc52b3eb..77d1c0874a 100644 --- a/hw/9pfs/virtio-9p.c +++ b/hw/9pfs/virtio-9p.c @@ -423,6 +423,22 @@ static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs) v9fs_string_sprintf(lhs, "%s", rhs->data); } +/* + * Return TRUE if s1 is an ancestor of s2. + * + * E.g. "a/b" is an ancestor of "a/b/c" but not of "a/bc/d". + * As a special case, We treat s1 as ancestor of s2 if they are same! + */ +static int v9fs_path_is_ancestor(V9fsString *s1, V9fsString *s2) +{ + if (!strncmp(s1->data, s2->data, s1->size)) { + if (s2->data[s1->size] == '\0' || s2->data[s1->size] == '/') { + return 1; + } + } + return 0; +} + static size_t v9fs_string_size(V9fsString *str) { return str->size; @@ -2805,13 +2821,13 @@ static int v9fs_complete_rename(V9fsState *s, V9fsRenameState *vs) for (fidp = s->fid_list; fidp; fidp = fidp->next) { if (vs->fidp == fidp) { /* - * we replace name of this fid towards the end - * so that our below strcmp will work + * we replace name of this fid towards the end so + * that our below v9fs_path_is_ancestor check will + * work */ continue; } - if (!strncmp(vs->fidp->path.data, fidp->path.data, - strlen(vs->fidp->path.data))) { + if (v9fs_path_is_ancestor(&vs->fidp->path, &fidp->path)) { /* replace the name */ v9fs_fix_path(&fidp->path, &vs->name, strlen(vs->fidp->path.data)); |