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From: "godlygeek at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29530] New: segfault in printf handling thousands
 separator
Date: Sat, 27 Aug 2022 00:27:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29530

            Bug ID: 29530
           Summary: segfault in printf handling thousands separator
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: godlygeek at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

printf segfaults when running:
```
#include <stdio.h>
#include <locale.h>

int main() {
    setlocale(LC_ALL, "en_US.UTF-8");
    printf("%'1000d\n", 1000);
}
```

Godbolt reproducer: https://godbolt.org/z/oaoqMv1v7

That's glibc 2.31, which is the newest I've been able to test with. This ma=
y be
the same issue as db6c4935, since it is crashing in memmove under
__vfprintf_internal - but if so, the impact analysis of that bug ("I believe
this code ... is unreachable in prior glibc releases") seems to have been
incorrect.

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