path: root/include/linux/ftrace.h
diff options
authorSteven Rostedt (Red Hat) <>2016-01-05 20:32:47 -0500
committerSteven Rostedt <>2016-01-07 12:17:39 -0500
commit049fb9bd416077b3622d317a45796be4f2431df3 (patch)
tree407e360324e0370e8a4e73e15de76959e6ea1f24 /include/linux/ftrace.h
parentf36d1be2930ede0a1947686e1126ffda5d5ee1bb (diff)
ftrace/module: Call clean up function when module init fails early
If the module init code fails after calling ftrace_module_init() and before calling do_init_module(), we can suffer from a memory leak. This is because ftrace_module_init() allocates pages to store the locations that ftrace hooks are placed in the module text. If do_init_module() fails, it still calls the MODULE_GOING notifiers which will tell ftrace to do a clean up of the pages it allocated for the module. But if load_module() fails before then, the pages allocated by ftrace_module_init() will never be freed. Call ftrace_release_mod() on the module if load_module() fails before getting to do_init_module(). Link: Reported-by: "Qiu, PeiyangX" <> Fixes: a949ae560a511 "ftrace/module: Hardcode ftrace_module_init() call into load_module()" Cc: # v2.6.38+ Acked-by: Rusty Russell <> Signed-off-by: Steven Rostedt <>
Diffstat (limited to 'include/linux/ftrace.h')
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index eae6548efbf0..60048c50404e 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -586,6 +586,7 @@ extern int ftrace_arch_read_dyn_info(char *buf, int size);
extern int skip_trace(unsigned long ip);
extern void ftrace_module_init(struct module *mod);
+extern void ftrace_release_mod(struct module *mod);
extern void ftrace_disable_daemon(void);
extern void ftrace_enable_daemon(void);