extmod/vfs_lfsx: Fix offset used before range check.
Use of offset 'from' should follow the range check. Signed-off-by: Mingjie Shen <shen497@purdue.edu>
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@ -323,7 +323,7 @@ STATIC mp_obj_t MP_VFS_LFSx(chdir)(mp_obj_t self_in, mp_obj_t path_in) {
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size_t from = 1;
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char *cwd = vstr_str(&self->cur_dir);
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while (from < CWD_LEN) {
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for (; cwd[from] == '/' && from < CWD_LEN; ++from) {
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for (; from < CWD_LEN && cwd[from] == '/'; ++from) {
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// Scan for the start
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}
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if (from > to) {
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@ -331,7 +331,7 @@ STATIC mp_obj_t MP_VFS_LFSx(chdir)(mp_obj_t self_in, mp_obj_t path_in) {
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vstr_cut_out_bytes(&self->cur_dir, to, from - to);
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from = to;
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}
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for (; cwd[from] != '/' && from < CWD_LEN; ++from) {
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for (; from < CWD_LEN && cwd[from] != '/'; ++from) {
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// Scan for the next /
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}
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if ((from - to) == 1 && cwd[to] == '.') {
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