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evtag: detect tags over 32-bits earlier

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This commit is contained in:
Nick Mathewson 2014-03-18 12:27:14 -04:00
parent e660db6d5f
commit 31c491504e
1 changed files with 8 additions and 1 deletions
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9
event_tagging.c
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@ -210,7 +210,14 @@ decode_tag_internal(ev_uint32_t *ptag, struct evbuffer *evbuf, int dodrain)
while (count++ < len) { while (count++ < len) {
ev_uint8_t lower = *data++; ev_uint8_t lower = *data++;
number |= (lower & 0x7f) << shift; if (shift >= 28) {
/* Make sure it fits into 32 bits */
if (shift > 28)
return (-1);
if ((lower & 0x7f) > 15)
return (-1);
}
number |= (lower & (unsigned)0x7f) << shift;
shift += 7; shift += 7;
if (!(lower & 0x80)) { if (!(lower & 0x80)) {