[Bug libc/16917] New: libc6: ptsname_r() can use uninitialized memory

["aurelien at aurel32 dot net" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16917

            Bug ID: 16917
           Summary: libc6: ptsname_r() can use uninitialized memory
           Product: glibc
           Version: 2.13
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: aurelien at aurel32 dot net
          Reporter: aurelien at aurel32 dot net
                CC: drepper.fsp at gmail dot com

If the fd refers to a terminal device, but not a pty master, the TIOCGPTN ioctl
returns with ENOTTY. This error is not caught, and the possibly undefined
buffer passed to ptsname_r is sent directly to the stat64 syscall.

For more details, see ttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741482

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