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Prevent unneeded memory allocation for language tags in libwc

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cf. https://oss-fuzz.com/testcase-detail/6275874304425984
Bug-Chromium: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31397
This commit is contained in:
Tatsuya Kinoshita
2021-03-23 19:02:12 +09:00
parent c9ead0a521
commit f70cacbbd7
1 changed files with 6 additions and 1 deletions
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5
libwc/ucs.c
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@@ -702,8 +702,13 @@ wtf_push_ucs(Str os, wc_uint32 ucs, wc_status *st)
if (! WcOption.use_language_tag) if (! WcOption.use_language_tag)
return; return;
if (ucs == WC_C_LANGUAGE_TAG) if (ucs == WC_C_LANGUAGE_TAG)
if (st->tag)
Strclear(st->tag);
else
st->tag = Strnew_size(MAX_TAG_LEN); st->tag = Strnew_size(MAX_TAG_LEN);
else if (ucs == WC_C_CANCEL_TAG) { else if (ucs == WC_C_CANCEL_TAG) {
if (st->tag)
Strfree(st->tag);
st->tag = NULL; st->tag = NULL;
st->ntag = 0; st->ntag = 0;
} else if (st->tag && st->tag->length < MAX_TAG_LEN && } else if (st->tag && st->tag->length < MAX_TAG_LEN &&