Kir Kolyshkin 195893d381 c.RWLayer: check for nil before use ...

Since commit e9b9e4ace2 has landed, there is a chance that
container.RWLayer is nil (due to some half-removed container). Let's
check the pointer before use to avoid any potential nil pointer
dereferences, resulting in a daemon crash.

Note that even without the abovementioned commit, it's better to perform
an extra check (even it's totally redundant) rather than to have a
possibility of a daemon crash. In other words, better be safe than
sorry.

[v2: add a test case for daemon.getInspectData]
[v3: add a check for container.Dead and a special error for the case]

Fixes: e9b9e4ace2
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

2018-02-09 11:24:09 -08:00

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