Fix: kretprobe: null ptr deref on session destroy
authorFrancis Deslauriers <francis.deslauriers@efficios.com>
Wed, 17 Mar 2021 14:40:56 +0000 (10:40 -0400)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Wed, 17 Mar 2021 17:45:23 +0000 (13:45 -0400)
commit62c465b685a72e86d0a2b6ac54b83c17e1c75b37
tree84b475ba00d98aba57b86521eec7eea733e43751
parente2aacede04e3f19ecae6157d7028af7c58007789
Fix: kretprobe: null ptr deref on session destroy

The `filter_bytecode_runtime_head` list is currently not initialized for
the return event of the kretprobe. This caused a kernel null ptr
dereference when destroying a session. It can reproduced with the
following commands:

  lttng create
  lttng enable-event -k --function=lttng_test_filter_event_write my_event
  lttng start
  lttng stop
  lttng destroy

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I1162ce8b10dd7237a26331531f048346b984eee7
lttng-events.c
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