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Code Packages Activity

bees: fix further instances of copy-after-unlock bug

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Before:

        unique_lock<mutex> lock(some_mutex);
        // run lock.~unique_lock() because return
        // return reference to unprotected heap
        return foo[bar];

After:

        unique_lock<mutex> lock(some_mutex);
        // make copy of object on heap protected by mutex lock
        auto tmp_copy = foo[bar];
        // run lock.~unique_lock() because return
        // pass locally allocated object to copy constructor
        return tmp_copy;

Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell
2017-01-22 21:50:21 -05:00
parent 6099bf0b01
commit db8ea92133
3 changed files with 16 additions and 8 deletions
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6
src/bees-types.cc
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@@ -286,7 +286,8 @@ Fd
BeesFileRange::fd() const
{
unique_lock<mutex> lock(s_mutex);
return m_fd;
auto rv = m_fd;
return rv;
}
Fd
@@ -310,7 +311,8 @@ BeesFileRange::fd(const shared_ptr<BeesContext> &ctx) const
}
}
// We either had a fid and opened it, or we didn't and we're just stuck with our fd
return m_fd;
auto rv = m_fd;
return rv;
}
BeesFileRange