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revlog: fix out-of-bounds access by negative parents read from revlog (SEC)...

revlog: fix out-of-bounds access by negative parents read from revlog (SEC) wasn't enough. Several callers don't check negative revisions but for -1 (nullrev), which would directly lead to out-of-bounds read, and buffer overflow could follow. RCE might be doable with carefully crafted revlog structure, though I don't think this would be useful attack surface.

Augie Fackler - - Load All Authors

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      # Copyright 2016-present Facebook. All Rights Reserved.

      #

      # error: errors used in fastannotate

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      from __future__ import absolute_import

      class CorruptedFileError(Exception):

          pass

      class CannotReuseError(Exception):

          """cannot reuse or update the cache incrementally"""

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				# Copyright 2016-present Facebook. All Rights Reserved.
				#
				# error: errors used in fastannotate
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.
				from __future__ import absolute_import

				class CorruptedFileError(Exception):
				pass

				class CannotReuseError(Exception):
				"""cannot reuse or update the cache incrementally"""