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[Bug network/20112] sunrpc: stack (frame) overflow in Sun RPC clntudp_call (CVE-2016-4429)

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The branch, release/2.24/master has been updated
       via  36f173ab3709b4a920a833b9af67f30bcba1ea01 (commit)
      from  6aacb5befa4992dcbd6df17e914dd802fba8a1ea (commit)

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- Log -----------------------------------------------------------------;h=36f173ab3709b4a920a833b9af67f30bcba1ea01

commit 36f173ab3709b4a920a833b9af67f30bcba1ea01
Author: Florian Weimer <>
Date:   Mon Feb 27 19:05:13 2017 +0100

    sunrpc: Avoid use-after-free read access in clntudp_call [BZ #21115]

    After commit bc779a1a5b3035133024b21e2f339fe4219fb11c
    (CVE-2016-4429: sunrpc: Do not use alloca in clntudp_call
    [BZ #20112]), ancillary data is stored on the heap,
    but it is accessed after it has been freed.

    The test case must be run under a heap debugger such as valgrind
    to observe the invalid access.  A malloc implementation which
    immediately calls munmap on free would catch this bug as well.

    (cherry picked from commit d42eed4a044e5e10dfb885cf9891c2518a72a491)


Summary of changes:
 ChangeLog              |    8 ++++++
 sunrpc/Makefile        |    3 +-
 sunrpc/clnt_udp.c      |    2 +-
 sunrpc/tst-udp-error.c |   62 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 73 insertions(+), 2 deletions(-)
 create mode 100644 sunrpc/tst-udp-error.c

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