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initialize local variable for UBSAN in PosixEnv function

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Summary:
this is a repeat commit of a8a28da2159648a2f72c35ea507371df8a97a2a9, which got reverted together with 6afe22db2e667799d8c903db61750d676bffe152, but forgotten about when that commit was un-reverted in 46152d53bf58748fc3ed0681d8970c342bcfc47a.
Closes https://github.com/facebook/rocksdb/pull/3796

Differential Revision: D7826077

Pulled By: ajkr

fbshipit-source-id: edb22375da56e2feda50c5b35f942f4d2d52b19c
This commit is contained in:
Andrew Kryczka 2018-05-01 13:18:01 -07:00 committed by Facebook Github Bot
parent 46152d53bf
commit 19fde54841
1 changed files with 1 additions and 1 deletions
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2
env/env_posix.cc vendored
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@ -479,7 +479,7 @@ class PosixEnv : public Env {
if (status.ok()) {
status = GetFileSize(fname, &size);
}
void* base;
void* base = nullptr;
if (status.ok()) {
base = mmap(nullptr, static_cast<size_t>(size), PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);