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Issue #10916: mmap should not segfault when a file is mapped using 0 as

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length and a non-zero offset, and an attempt to read past the end of file
is made (IndexError is raised instead).  Patch by Ross Lagerwall.

Requested by Georg.
This commit is contained in:
Antoine Pitrou 2011-01-15 16:17:07 +00:00
parent f5cf435bb5
commit 85f4615500
3 changed files with 18 additions and 1 deletions
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Modules/mmapmodule.c
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@ -1116,7 +1116,7 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
# endif
if (fd != -1 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
if (map_size == 0) {
map_size = st.st_size;
map_size = st.st_size - offset;
} else if ((size_t)offset + (size_t)map_size > st.st_size) {
PyErr_SetString(PyExc_ValueError,
"mmap length is greater than file size");