Mercurial > hg-stable
changeset 7174:4da87407b845
parsers.c: fix integer overflows
thanks to zzuf for helping finding those
| author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
|---|---|
| date | Sun, 19 Oct 2008 20:16:37 +0200 |
| parents | 834b8d7bd597 |
| children | 5d8626b2c1db |
| files | mercurial/parsers.c |
| diffstat | 1 files changed, 12 insertions(+), 4 deletions(-) [+] |
line wrap: on
line diff
--- a/mercurial/parsers.c Sun Oct 19 16:11:23 2008 +0200 +++ b/mercurial/parsers.c Sun Oct 19 20:16:37 2008 +0200 @@ -164,7 +164,8 @@ PyObject *dmap, *cmap, *parents = NULL, *ret = NULL; PyObject *fname = NULL, *cname = NULL, *entry = NULL; char *str, *cur, *end, *cpos; - int state, mode, size, mtime, flen; + int state, mode, size, mtime; + unsigned int flen; int len; char decode[16]; /* for alignment */ @@ -195,8 +196,10 @@ mtime = ntohl(*(uint32_t *)(decode + 8)); flen = ntohl(*(uint32_t *)(decode + 12)); cur += 17; - if (cur + flen > end) + if (flen > end - cur) { + PyErr_SetString(PyExc_ValueError, "overflow in dirstate"); goto quit; + } entry = Py_BuildValue("ciii", state, mode, size, mtime); PyObject_GC_UnTrack(entry); /* don't waste time with this */ @@ -294,6 +297,8 @@ const char *end = data + size; while (data < end) { + unsigned int step; + offset_flags = ntohl(*((uint32_t *) (data + 4))); if (n == 0) /* mask out version number for the first entry */ offset_flags &= 0xFFFF; @@ -325,10 +330,13 @@ } else PyList_SET_ITEM(index, n, entry); /* steals reference */ - data += 64 + (inlined ? comp_len : 0); n++; + step = 64 + (inlined ? comp_len : 0); + if (end - data < step) + break; + data += step; } - if (data > end) { + if (data != end) { if (!PyErr_Occurred()) PyErr_SetString(PyExc_ValueError, "corrupt index file"); return 0;