[Bug libc/17542] conditional jump depends on uninitialised value in svc_getreq_common

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https://sourceware.org/bugzilla/show_bug.cgi?id=17542

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ed6b0fe710b631b99ed9fc28cefedfe69a16dc55

commit ed6b0fe710b631b99ed9fc28cefedfe69a16dc55
Author: Brad Hubbard <bhubbard@redhat.com>
Date:   Wed Mar 18 14:51:26 2015 +0530

    Use calloc to allocate xports (BZ #17542)

    If xports is NULL in xprt_register we malloc it but if sock >
    _rpc_dtablesize() that memory does not get initialised and may in theory
    contain any value. Later we make a conditional jump in svc_getreq_common
    based on the uninitialised memory and this caused a general protection
    fault in rpc.statd on an older version of glibc but this code has not
    changed since that version.

    Following is the valgrind warning.

    ==26802== Conditional jump or move depends on uninitialised value(s)
    ==26802==    at 0x5343A25: svc_getreq_common (in /lib64/libc-2.5.so)
    ==26802==    by 0x534357B: svc_getreqset (in /lib64/libc-2.5.so)
    ==26802==    by 0x10DE1F: ??? (in /sbin/rpc.statd)
    ==26802==    by 0x10D0EF: main (in /sbin/rpc.statd)
    ==26802==  Uninitialised value was created by a heap allocation
    ==26802==    at 0x4C2210C: malloc (vg_replace_malloc.c:195)
    ==26802==    by 0x53438BE: xprt_register (in /lib64/libc-2.5.so)
    ==26802==    by 0x53450DF: svcudp_bufcreate (in /lib64/libc-2.5.so)
    ==26802==    by 0x10FE32: ??? (in /sbin/rpc.statd)
    ==26802==    by 0x10D13E: main (in /sbin/rpc.statd)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog    |    5 +++++
 NEWS         |   11 +++++------
 sunrpc/svc.c |    4 ++--
 3 files changed, 12 insertions(+), 8 deletions(-)

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