>Number:         140309

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>Category:       bin

>Synopsis:       bad syntax cause yacc segfault

>Confidential:   no

>Severity:       non-critical

>Priority:       low

>Responsible:    freebsd-bugs

>State:          open

>Quarter:

>Keywords:

>Date-Required:

>Class:          sw-bug

>Submitter-Id:   current-users

>Arrival-Date:   Thu Nov 05 12:50:02 UTC 2009

>Closed-Date:

>Last-Modified:

>Originator:     Philippe Pepiot

>Release:        9.0 CURRENT

>Organization:

>Environment:

FreeBSD shen.philpep.org 9.0-CURRENT FreeBSD 9.0-CURRENT #0: Wed Nov  4 19:56:02 CET 2009     root@shen.philpep.org:/usr/src/sys/i386/compile/SHEN  i386

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>Description:

Sometimes yacc segfault when declare typed rule and you don't set a value to $$ in the grammar rule.

The expected behavior of yacc in this case is to print an error message like

"the value of typed rule hasn't been set".
Here's backtrace :
#0  0x08053811 in end_rule () at /usr/src/usr.bin/yacc/reader.c:1260

1260            if (pitem[i+1] == 0 || pitem[i+1]->tag != plhs[nrules]->tag)
#0  0x08053811 in end_rule () at /usr/src/usr.bin/yacc/reader.c:1260

#1  0x0805486d in read_grammar () at /usr/src/usr.bin/yacc/reader.c:1632

#2  0x08055591 in reader () at /usr/src/usr.bin/yacc/reader.c:1926

#3  0x0804c4b4 in main (argc=2, argv=0xbfbfeb48) at /usr/src/usr.bin/yacc/main.c:434

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>How-To-Repeat:

Just yacc this file :

%type  rule

%%

rule:

    ;

%%
$ yacc file.y

segmentation fault (core dumped) /usr/bin/yacc

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>Fix:

>Release-Note:

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>Audit-Trail:

>Unformatted:

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