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bounds check for bad data (thanks amaury)

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This commit is contained in:
Philip Jenvey 2012-10-26 17:01:53 -07:00
parent a20879ffc8
commit 45c41494bf
2 changed files with 6 additions and 3 deletions
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7
Python/codecs.c
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@ -821,9 +821,10 @@ PyCodec_SurrogatePassErrors(PyObject *exc)
/* Try decoding a single surrogate character. If
there are more, let the codec call us again. */
p += start;
if ((p[0] & 0xf0) == 0xe0 ||
(p[1] & 0xc0) == 0x80 ||
(p[2] & 0xc0) == 0x80) {
if (strlen(p) > 2 &&
((p[0] & 0xf0) == 0xe0 ||
(p[1] & 0xc0) == 0x80 ||
(p[2] & 0xc0) == 0x80)) {
/* it's a three-byte code */
ch = ((p[0] & 0x0f) << 12) + ((p[1] & 0x3f) << 6) + (p[2] & 0x3f);
if (ch < 0xd800 || ch > 0xdfff)