From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 20 Feb 2020 14:58:42 +0000 (-0500)
Subject: Fix: statedump: check task_active_pid_ns return value for NULL
X-Git-Tag: v2.11.2~13
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=d16203a5ed1ae740b5a0fcc681b58c315227fbb3;hp=d16203a5ed1ae740b5a0fcc681b58c315227fbb3;p=lttng-modules.git

Fix: statedump: check task_active_pid_ns return value for NULL

The lttng-statedump checks the return value of task_active_pid_ns()
before each use within trace_lttng_statedump_process_state(), but misses
the NULL check before dereferencing pid_ns->parent.

This race happens if a task exists in "dead" state while the statedump
iterates on that task.

Reported-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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