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Fix overread in js normalization #868

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Merged
val-ms merged 1 commit into from
Apr 1, 2023
Merged

Fix overread in js normalization #868

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4 changes: 4 additions & 0 deletions libclamav/jsparse/js-norm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -787,6 +787,10 @@ static void handle_df(const yystype *tokens, size_t start, struct decode_result
static void handle_eval(struct tokens *tokens, size_t start, struct decode_result *res)
{
res->txtbuf.data = TOKEN_GET(&tokens->data[start], string);

if (start + 1 >= tokens->cnt)
return;

if (res->txtbuf.data && tokens->data[start + 1].type == TOK_PAR_CLOSE) {
TOKEN_SET(&tokens->data[start], string, NULL);
res->txtbuf.pos = strlen(res->txtbuf.data);
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