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Closes #15676: mmap: add empty file check prior to offset check

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Jesus Cea 2012-09-10 00:22:39 +02:00
parent 10fc104fed
commit 8b54d6d733
3 changed files with 24 additions and 0 deletions
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5
Modules/mmapmodule.c
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@ -1189,6 +1189,11 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
if (fd != -1 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
if (map_size == 0) {
off_t calc_size;
if (st.st_size == 0) {
PyErr_SetString(PyExc_ValueError,
"cannot mmap an empty file");
return NULL;
}
if (offset >= st.st_size) {
PyErr_SetString(PyExc_ValueError,
"mmap offset is greater than file size");