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Subject[PATCH] ftrace: Avoid double-free of dyn_ftrace
If dyn_ftrace is free before ftrace_release(),
ftrace_release() will free it again and make ftrace_free_records wrong.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
---
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 d33d306..26c45aa 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);
--
1.5.5.3



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