diff options
Diffstat (limited to 'extmod/vfs.c')
| -rw-r--r-- | extmod/vfs.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/extmod/vfs.c b/extmod/vfs.c index a1cd8d5f6..44ad8ffad 100644 --- a/extmod/vfs.c +++ b/extmod/vfs.c @@ -38,6 +38,10 @@ #include "extmod/vfs_fat.h" #endif +// For mp_vfs_proxy_call, the maximum number of additional args that can be passed. +// A fixed maximum size is used to avoid the need for a costly variable array. +#define PROXY_MAX_ARGS (2) + // path is the path to lookup and *path_out holds the path within the VFS // object (starts with / if an absolute path). // Returns MP_VFS_ROOT for root dir (and then path_out is undefined) and @@ -97,6 +101,7 @@ STATIC mp_vfs_mount_t *lookup_path(mp_obj_t path_in, mp_obj_t *path_out) { } STATIC mp_obj_t mp_vfs_proxy_call(mp_vfs_mount_t *vfs, qstr meth_name, size_t n_args, const mp_obj_t *args) { + assert(n_args <= PROXY_MAX_ARGS); if (vfs == MP_VFS_NONE) { // mount point not found mp_raise_OSError(MP_ENODEV); @@ -105,7 +110,7 @@ STATIC mp_obj_t mp_vfs_proxy_call(mp_vfs_mount_t *vfs, qstr meth_name, size_t n_ // can't do operation on root dir mp_raise_OSError(MP_EPERM); } - mp_obj_t meth[n_args + 2]; + mp_obj_t meth[2 + PROXY_MAX_ARGS]; mp_load_method(vfs->obj, meth_name, meth); if (args != NULL) { memcpy(meth + 2, args, n_args * sizeof(*args)); |