missing unlock in crypt/rand/rand_unix.go

[bradfitz]

Just noticed on ,

http://code.google.com/p/go/source/browse/src/pkg/crypto/rand/rand_unix.go?spec=svn42e4767b10beb7eeb7a3c7db372279e8c01b45c3&;r=42e4767b10beb7eeb7a3c7db372279e8c01b45c3


func (r *devReader) Read(b []byte) (n int, err os.Error) {
    r.mu.Lock()
    if r.f == nil {
        f, err := os.Open(r.name, os.O_RDONLY, 0)
        if f == nil {
>>>>>>>>>>>>>>>>>>>>>>>
/// MISSING m.mu.Unlock()
            return 0, err
        }
        r.f = f
    }
    r.mu.Unlock()
    return r.f.Read(b)
}

[rsc]

Comment 1:

codereview.appspot.com/1812043

Owner changed to r...@golang.org.

Status changed to Started.

[peterGo]

Comment 2:

By design, all versions of crypto/rand minimize differences, and use the same or similar
patterns wherever possible. Therefore, if it's wrong in Unix, it's probably wrong in
Windows too. And it is.

[bradfitz]

Comment 3:

$ hg diff pkg/crypto/rand/rand_windows.go
diff -r 4f91458c5765 src/pkg/crypto/rand/rand_windows.go
--- a/src/pkg/crypto/rand/rand_windows.go       Tue Jul 13 10:47:52 2010 +1000
+++ b/src/pkg/crypto/rand/rand_windows.go       Tue Jul 13 11:09:52 2010 -0700
@@ -30,6 +30,7 @@
                const flags = syscall.CRYPT_VERIFYCONTEXT | syscall.CRYPT_SILENT
                ok, errno := syscall.CryptAcquireContext(&r.prov, nil, nil, provType, flags)
                if !ok {
+                       r.mu.Unlock()
                        return 0, os.NewSyscallError("CryptAcquireContext", errno)
                }
        }

[peterGo]

Comment 4:

http://golang.org/cl/1764044

[bradfitz]

Comment 5:

Fixed by http://code.google.com/p/go/source/detail?r=aad39c7d3d87

[robpike]

Comment 6:

Status changed to Fixed.