[Bug 998256] [NEW] regcomp fails with custom malloc

[Robert Vollmert]

Public bug reported:

regcomp fails to compile the regular expression "^ " with memory error
if malloc(0) returns NULL. That's valid malloc behavior, compare
malloc(3).

I had a little trouble debugging, but I believe the problem lies with
posix/regex_internal.c:re_node_set_alloc being called with size == 0.

I'm attaching a test program that should exhibit the bug.

ETA: I've tested this with libc6_2.15-0ubuntu10_amd64 under VMWare.

** Affects: eglibc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/998256

Title:
  regcomp fails with custom malloc

Status in “eglibc” package in Ubuntu:
  New

Bug description:
  regcomp fails to compile the regular expression "^ " with memory error
  if malloc(0) returns NULL. That's valid malloc behavior, compare
  malloc(3).

  I had a little trouble debugging, but I believe the problem lies with
  posix/regex_internal.c:re_node_set_alloc being called with size == 0.

  I'm attaching a test program that should exhibit the bug.

  ETA: I've tested this with libc6_2.15-0ubuntu10_amd64 under VMWare.

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