[Rd] segmentation fault: formula() with long variable names
(PR#3704)
luke at stat.uiowa.edu
luke at stat.uiowa.edu
Sat Aug 9 20:18:44 MEST 2003
On Thu, 7 Aug 2003 jerome at hivnet.ubc.ca wrote:
> R version: 1.7.1
> OS: Red Hat Linux 7.2
>
> In this example, I would expect an error for the overly long variable
> name. This is always reproducable for me.
>
> > formula(paste("y~",paste(rep("x",50000),collapse="")))
> Segmentation fault
>
> Sincerely,
> Jerome Asselin
The problem seems to be in parse, which formula.default calls:
> parse(text=paste(rep("x",50000),collapse=""))
Segmentation fault (core dumped)
We were filling the yytext buffer in gram.y with no overflow checking.
I've added some checking in R-devel, so these now give
> parse(text=paste(rep("x",50000),collapse=""))
Error in parse(text = paste(rep("x", 50000), collapse = "")) :
input buffer overflow
> formula(paste("y~",paste(rep("x",50000),collapse="")))
Error in parse(text = x) : input buffer overflow
luke
--
Luke Tierney
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke at stat.uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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