On 5/28/24 19:35, Hadley Wickham wrote:
Hi all,
When I run the following code, R segfaults:
text <- "×"
srcfile <- srcfilecopy("test.r", text)
parse(textConnection(text), srcfile = srcfile)
It doesn't segfault if text is ASCII, or it's not wrapped in
textConnection, or srcfile isn't set.
Thanks, this is because R parser doesn't support non-ASCII UTF-8 outside
string literals and comments, plus a missing bounds check. The "correct"
result should be an R error, which I get in a debug build.
The tokenizer ends up with a negative token and then when the parse data
are being finalized, creating a table of token names, there is an out of
bounds access (yytname array). Probably the check should go right away
into the tokenizer.
Tomas
Hadley
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