diff options
| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-04-05 13:36:18 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-04-20 22:06:44 -0400 |
| commit | 8d70725e452cac9796e9025ccd79c45ffcc4d109 (patch) | |
| tree | 2db0703a73df7d182204b2d65d1c71a3d441a246 /kernel/trace | |
| parent | ftrace: Have the function probes call their own function (diff) | |
| download | linux-dev-8d70725e452cac9796e9025ccd79c45ffcc4d109.tar.xz linux-dev-8d70725e452cac9796e9025ccd79c45ffcc4d109.zip | |
ftrace: If the hash for a probe fails to update then free what was initialized
If the ftrace_hash_move_and_update_ops() fails, and an ops->free() function
exists, then it needs to be called on all the ops that were added by this
registration.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ftrace.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 493c7ff7e860..8394055e6793 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -4003,7 +4003,7 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, ret = ftrace_hash_move_and_update_ops(&ops->ops, orig_hash, hash, 1); if (ret < 0) - goto out_unlock; + goto err_unlock; if (list_empty(&ops->list)) list_add(&ops->list, &ftrace_func_probes); @@ -4021,6 +4021,20 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, free_ftrace_hash(hash); return ret; + + err_unlock: + if (!ops->free) + goto out_unlock; + + /* Failed to do the move, need to call the free functions */ + for (i = 0; i < size; i++) { + hlist_for_each_entry(entry, &hash->buckets[i], hlist) { + if (ftrace_lookup_ip(old_hash, entry->ip)) + continue; + ops->free(ops, entry->ip, NULL); + } + } + goto out_unlock; } int |