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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2016-01-05 20:32:47 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-01-07 12:17:39 -0500 |
| commit | 049fb9bd416077b3622d317a45796be4f2431df3 (patch) | |
| tree | 407e360324e0370e8a4e73e15de76959e6ea1f24 /include | |
| parent | f36d1be2930ede0a1947686e1126ffda5d5ee1bb (diff) | |
| download | lwn-049fb9bd416077b3622d317a45796be4f2431df3.tar.gz lwn-049fb9bd416077b3622d317a45796be4f2431df3.zip | |
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: http://lkml.kernel.org/r/567CEA31.1070507@intel.com
Reported-by: "Qiu, PeiyangX" <peiyangx.qiu@intel.com>
Fixes: a949ae560a511 "ftrace/module: Hardcode ftrace_module_init() call into load_module()"
Cc: stable@vger.kernel.org # v2.6.38+
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ftrace.h | 1 |
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); |