[Bug 1259656] Re: bc uses uninitialized memory

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** Branch linked: lp:ubuntu/precise-proposed/bc

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https://bugs.launchpad.net/bugs/1259656

Title:
  bc uses uninitialized memory

Status in “bc” package in Ubuntu:
  Fix Released
Status in “bc” source package in Precise:
  Fix Committed
Status in “bc” package in Debian:
  Fix Released

Bug description:
  This is http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=608255 fixed
  in later package versions:

  bc depends on uninitialized mem:

  echo "e(1)" | MALLOC_PERTURB_=1 bc -l
  echo "e(1)" | MALLOC_PERTURB_=0 bc -l
  2.71828182845904523536

  This fixes it:

  --- storage.c.orig      2010-12-21 19:43:14.663540110 +0000
  +++ storage.c   2010-12-21 19:42:01.392540111 +0000
  @@ -99,6 +99,7 @@
      {
         f = &functions[indx];
         f->f_defined = FALSE;
  +      f->f_void = FALSE;
         f->f_body = (char *) bc_malloc (BC_START_SIZE);
         f->f_body_size = BC_START_SIZE;
         f->f_code_size = 0;

  
  IMPACT:
  "bc" mathlib routines fail when running under the MALLOC_PERTURB_ environment used by some paranoid people.

  TEST CASE:
  The command 'echo "e(1)" | MALLOC_PERTURB_=1 bc -l' should return '2.71828182845904523536' instead of nothing.

  REGRESSION POTENTIAL:
  Extremely low -- this fix is included in later package versions and fixes the problem.

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