[Bug libc/2337] New: libio in wide mode deallocates user supplied buffer

["Petr dot Salinger at seznam dot cz" <sourceware-bugzilla at sourceware dot org>]

Hello.

Please try to run attached source under "strace -e trace=mmap2,munmap"
At the end there will be something like:

hello.
buf = 0x8049160, fp = 0x804a008,  fp+delta = 0x804a04f
munmap(0x804a04f, 4096)                 = -1 EINVAL (Invalid argument)

On file close libio tries to free buffer, which have not been allocated by libio.
In first case it is internal 1byte buffer, but it can be also user specified buffer,
just compile with  -DUSER_BUF.  It leads to crashes.

Petr

-- 
           Summary: libio in wide mode deallocates user supplied buffer
           Product: glibc
           Version: 2.3.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: Petr dot Salinger at seznam dot cz
                CC: glibc-bugs at sources dot redhat dot com
  GCC host triplet: i486-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=2337

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