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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-04-05 13:36:18 -0400
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-04-20 22:06:44 -0400
commit8d70725e452cac9796e9025ccd79c45ffcc4d109 (patch)
tree2db0703a73df7d182204b2d65d1c71a3d441a246 /kernel/trace/ftrace.c
parenteee8ded131f15e0f5b1897c9c4a7687fabd28822 (diff)
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/ftrace.c')
-rw-r--r--kernel/trace/ftrace.c16
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