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Subject: [Bug regex/28864] Out of memory in regcomp() with many '+'
 characters in a row
Date: Sat, 05 Feb 2022 00:46:25 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28864

Alexander Kernozhitsky <sh200105 at mail dot ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Out of memory in regcomp()  |Out of memory in regcomp()
                   |with many '+' changes in a  |with many '+' characters in
                   |row                         |a row

--- Comment #1 from Alexander Kernozhitsky <sh200105 at mail dot ru> ---
The following program runs out of memory when being run:

#include <regex.h>
#include <stdlib.h>

int main() {
  const char *re =3D
"C+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
+++++++++++++++++";
  regex_t regex;
  if (regcomp(&regex, re, REG_NEWLINE | REG_EXTENDED)) {
    return EXIT_FAILURE;
  }
  return 0;
}

Steps to reproduce:

Compile and run the source code above.

Alternatively, the same bug is triggered when running `grep -E
'C++++++++++++++++++++++++++++++++++++++++++++++++'`.

I am using glibc 2.33-5 from Debian packages.

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