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infra: fix racy NULL deref on thread termination

This commit is contained in:
Thomas Schoebel-Theuer 2014-11-05 14:30:14 +01:00
parent 2b2e07d24d
commit b0171749a4
1 changed files with 7 additions and 6 deletions
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13
kernel/brick.h
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@ -652,12 +652,13 @@ extern void brick_thread_stop_nowait(struct task_struct *k);
#define brick_thread_stop(_thread) \
do { \
if (likely(_thread)) { \
BRICK_INF("stopping thread '%s'\n", (_thread)->comm); \
kthread_stop(_thread); \
BRICK_INF("thread '%s' finished.\n", (_thread)->comm); \
remove_binding(_thread); \
put_task_struct(_thread); \
struct task_struct *__thread__ = (_thread); \
if (likely(__thread__)) { \
BRICK_INF("stopping thread '%s'\n", __thread__->comm); \
kthread_stop(__thread__); \
BRICK_INF("thread '%s' finished.\n", __thread__->comm); \
remove_binding(__thread__); \
put_task_struct(__thread__); \
_thread = NULL; \
} \
} while (0)