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New conditional for adding key/value pairs to maps. 

When adding MultiDeviceKeys and their values into MultiDevice maps, make
sure the keys and values have not already been added. This ensures that
preexisting key/value pairs are not overridden.

PiperOrigin-RevId: 206942766
Change-Id: I9d85f38eb59ba59f0305e6614a52690608944981
This commit is contained in:
Brielle Broder 2018-08-01 09:43:47 -07:00 committed by Shentubot
parent 413bfb39a9
commit 6b87378634
1 changed files with 8 additions and 0 deletions
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8
pkg/sentry/device/device.go
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@ -183,6 +183,14 @@ func (m *MultiDevice) Load(key MultiDeviceKey, value uint64) bool {
m.rcache = make(map[uint64]MultiDeviceKey)
}
if val, exists := m.cache[key]; exists && val != value {
return false
}
if k, exists := m.rcache[value]; exists && k != key {
// Should never happen.
panic("MultiDevice's caches are inconsistent")
}
// Cache value at key.
m.cache[key] = value