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From: "nfxjfg at googlemail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/17829] New: Incorrect handling of precision specifier in printf family
Date: Mon, 12 Jan 2015 04:32:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=17829

            Bug ID: 17829
           Summary: Incorrect handling of precision specifier in printf
                    family
           Product: glibc
           Version: 2.19
            Status: NEW
          Severity: critical
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: nfxjfg at googlemail dot com
                CC: drepper.fsp at gmail dot com

The following program shows no output:

#include <stdio.h>
#include <limits.h>

int main(int argc, char **argv)
{
    printf("%.*s\n", INT_MAX, "hi");
    return 0;
}

The precision given is INT_MAX; this should turn the precision specifier into a
no-OP, equivalent to 'printf("%s\n", "hi");'. Making the precision value
somewhat lower seems to make it work.

snprintf() seems to have a similar issue, but the failure seems to start with
even lower precision values.

Other libcs handle this correctly (I tested mingw-w64 and musl).

Using glibc 2.19-13 on Debian 32 bit x86.

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