On Sun, Aug 4, 2013 at 3:59 AM, Roland Mainz <[email protected]> wrote:
> The following testcase...
> -- snip --
[snip]
> -- snip ---
> ... triggers a valgrind hit in ast-ksh.2013-07-27 on SuSE
> 12.3/AMD64/64bit when reading a user-defined type:
> -- snip --
> $ valgrind --num-callers=200 test1.sh
> ==3587== Memcheck, a memory error detector
> ==3587== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
> ==3587== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
> ==3587== Command: /home/test001/bin/ksh valgrind_unset.sh
> [snip]
> i=9
> ==3587== Conditional jump or move depends on uninitialised value(s)
> ==3587== at 0x42E39D: sh_lex (lex.c:505)
> ==3587== by 0x452AA3: simple (parse.c:1558)
> ==3587== by 0x45235E: item (parse.c:1405)
> ==3587== by 0x44F72C: term (parse.c:594)
> ==3587== by 0x44F610: list (parse.c:564)
> ==3587== by 0x44F4A6: sh_cmd (parse.c:514)
> ==3587== by 0x44F087: sh_parse (parse.c:403)
> ==3587== by 0x471E12: sh_eval_20120720 (xec.c:4126)
> ==3587== by 0x449983: read_tree (nvtree.c:67)
> ==3587== by 0x488F93: sh_readline (read.c:338)
> ==3587== by 0x48873E: b_read (read.c:177)
> ==3587== by 0x4689E0: sh_exec (xec.c:1360)
> ==3587== by 0x46BAC1: sh_exec (xec.c:2227)
> ==3587== by 0x471840: sh_funscope_20120720 (xec.c:4040)
> ==3587== by 0x46FA27: sh_funct (xec.c:3376)
> ==3587== by 0x469504: sh_exec (xec.c:1559)
> ==3587== by 0x40F471: exfile (main.c:603)
> ==3587== by 0x40E6BC: sh_main (main.c:375)
> ==3587== by 0x40D890: main (pmain.c:45)
> ==3587==
> -- snip --
Looking at the code...
-- snip --
502 case S_NL:
503 /* skip over new-lines */
504 lp->lex.last_quote = 0;
505 while(shp->inlineno++,fcget()=='\n');
506 fcseek(-LEN);
507 if(n==S_NLTOK)
508 {
509 lp->comp_assign = 0;
510 return(lp->token='\n');
511 }
-- snip --
... the issue here is |fcget()| in line 505 which somehow accesses a
memory area which has not been filled with data (maybe an off-by-one
mistake) ?
----
Bye,
Roland
--
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