[ovs-git] [openvswitch/ovs] b6db40: NSH: Fix NSH-related length macros that cause stac...

[GitHub]

  Branch: refs/heads/branch-2.10
  Home:   https://github.com/openvswitch/ovs
  Commit: b6db400ff5553acf2b9753adb9ff2cbb2cebd790
      https://github.com/openvswitch/ovs/commit/b6db400ff5553acf2b9753adb9ff2cbb2cebd790
  Author: Yifeng Sun <pkusunyifeng at gmail.com>
  Date:   2018-10-26 (Fri, 26 Oct 2018)

  Changed paths:
    M datapath/linux/compat/include/net/nsh.h
    M include/openvswitch/nsh.h

  Log Message:
  -----------
  NSH: Fix NSH-related length macros that cause stack overflow

In the filed of ver_flags_ttl_len of struct nshhdr, there are only 6
bits that are used to indicate header's total length in 4-byte words.
Therefore, the max value for total is 252 (63x4), instead of 256 used
in present code base. This patch fixes it.

Reported-at: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=10855
Signed-off-by: Yifeng Sun <pkusunyifeng at gmail.com>
Signed-off-by: Ben Pfaff <blp at ovn.org>



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