Augie Fackler <augie@google.com> [Wed, 09 Oct 2019 20:49:23 -0700] rev 43151
fuzz: exercise a little more revlog code
Differential Revision: https://phab.mercurial-scm.org/D7032
Augie Fackler <augie@google.com> [Wed, 09 Oct 2019 20:48:12 -0700] rev 43150
fuzz: new fuzzer for dirs.c
This found a six-year-old bug immediately, and then I put it through a
few CPU-days of time before sending it.
Differential Revision: https://phab.mercurial-scm.org/D7031
Augie Fackler <augie@google.com> [Tue, 08 Oct 2019 16:18:15 -0400] rev 43149
dirs: fix trivial over-read of input data
This code, introduced in 8c0a7eeda06d, was intentionally over-reading
an input string to avoid getting a shared string object for a one-byte
input. Unfortunately with an empty input (like in the case of a fuzzer
getting started) this was a trivial over-read and triggered an
AddressSanitizer failure.
I went out of my way to make sure the code still does the
copy-avoidance tricks. I don't think this change will cost us much
performance since the one-character strings should be cached
aggressively anyway.
Differential Revision: https://phab.mercurial-scm.org/D7030