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| author | Zhaolei <zhaolei@cn.fujitsu.com> | 2009-03-13 17:14:01 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-13 10:25:06 +0100 |
| commit | b00f0b6dc1773b4c8f538503247da050b5ea631b (patch) | |
| tree | 94c81517cb3d1def0c0f9ccb33c48fb03c0f1c75 /kernel/trace/ftrace.c | |
| parent | 62a394eb77a1ddea73273f53ed8c3ccf6e04f2fb (diff) | |
| download | lwn-b00f0b6dc1773b4c8f538503247da050b5ea631b.tar.gz lwn-b00f0b6dc1773b4c8f538503247da050b5ea631b.zip | |
ftrace: avoid double-free of dyn_ftrace
If dyn_ftrace is freed before ftrace_release(), ftrace_release()
will free it again and make ftrace_free_records wrong.
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Cc: "Steven Rostedt ;" <rostedt@goodmis.org>
LKML-Reference: <49BA23D9.1050900@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index d33d306bdcf4..26c45aaf6805 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -356,7 +356,8 @@ void ftrace_release(void *start, unsigned long size) mutex_lock(&ftrace_lock); do_for_each_ftrace_rec(pg, rec) { - if ((rec->ip >= s) && (rec->ip < e)) + if ((rec->ip >= s) && (rec->ip < e) && + !(rec->flags & FTRACE_FL_FREE)) ftrace_free_rec(rec); } while_for_each_ftrace_rec(); mutex_unlock(&ftrace_lock); |