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This includes a fix to a memory leak when adding filters to traces.

Browse Source 
Also, Masami Hiramatsu fixed up some minor bugs that were discovered
 by sparse.
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Merge tag 'trace-fixes-v3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "This includes a fix to a memory leak when adding filters to traces.

  Also, Masami Hiramatsu fixed up some minor bugs that were discovered
  by sparse."

* tag 'trace-fixes-v3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing/kprobes: Make print_*probe_event static
  tracing/kprobes: Fix a sparse warning for incorrect type in assignment
  tracing/kprobes: Use rcu_dereference_raw for tp->files
  tracing: Fix leaks of filter preds
This commit is contained in:
Linus Torvalds 2013-05-15 14:08:57 -07:00
commit c240a539df
2 changed files with 44 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/trace/trace_events_filter.c
View File

@ -750,7 +750,11 @@ static int filter_set_pred(struct event_filter *filter,
static void __free_preds(struct event_filter *filter)
{
int i;
if (filter->preds) {
for (i = 0; i < filter->n_preds; i++)
kfree(filter->preds[i].ops);
kfree(filter->preds);
filter->preds = NULL;
}

53
kernel/trace/trace_kprobe.c
View File

@ -35,7 +35,7 @@ struct trace_probe {
const char *symbol; /* symbol name */
struct ftrace_event_class class;
struct ftrace_event_call call;
struct ftrace_event_file **files;
struct ftrace_event_file * __rcu *files;
ssize_t size; /* trace entry size */
unsigned int nr_args;
struct probe_arg args[];
@ -185,9 +185,14 @@ static struct trace_probe *find_trace_probe(const char *event,
static int trace_probe_nr_files(struct trace_probe *tp)
{
struct ftrace_event_file **file = tp->files;
struct ftrace_event_file **file;
int ret = 0;
/*
* Since all tp->files updater is protected by probe_enable_lock,
* we don't need to lock an rcu_read_lock.
*/
file = rcu_dereference_raw(tp->files);
if (file)
while (*(file++))
ret++;
@ -209,9 +214,10 @@ enable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
mutex_lock(&probe_enable_lock);
if (file) {
struct ftrace_event_file **new, **old = tp->files;
struct ftrace_event_file **new, **old;
int n = trace_probe_nr_files(tp);
old = rcu_dereference_raw(tp->files);
/* 1 is for new one and 1 is for stopper */
new = kzalloc((n + 2) * sizeof(struct ftrace_event_file *),
GFP_KERNEL);
@ -251,11 +257,17 @@ enable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
static int
trace_probe_file_index(struct trace_probe *tp, struct ftrace_event_file *file)
{
struct ftrace_event_file **files;
int i;
if (tp->files) {
for (i = 0; tp->files[i]; i++)
if (tp->files[i] == file)
/*
* Since all tp->files updater is protected by probe_enable_lock,
* we don't need to lock an rcu_read_lock.
*/
files = rcu_dereference_raw(tp->files);
if (files) {
for (i = 0; files[i]; i++)
if (files[i] == file)
return i;
}
@ -274,10 +286,11 @@ disable_trace_probe(struct trace_probe *tp, struct ftrace_event_file *file)
mutex_lock(&probe_enable_lock);
if (file) {
struct ftrace_event_file **new, **old = tp->files;
struct ftrace_event_file **new, **old;
int n = trace_probe_nr_files(tp);
int i, j;
old = rcu_dereference_raw(tp->files);
if (n == 0 || trace_probe_file_index(tp, file) < 0) {
ret = -EINVAL;
goto out_unlock;
@ -872,9 +885,16 @@ __kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs,
static __kprobes void
kprobe_trace_func(struct trace_probe *tp, struct pt_regs *regs)
{
struct ftrace_event_file **file = tp->files;
/*
* Note: preempt is already disabled around the kprobe handler.
* However, we still need an smp_read_barrier_depends() corresponding
* to smp_wmb() in rcu_assign_pointer() to access the pointer.
*/
struct ftrace_event_file **file = rcu_dereference_raw(tp->files);
if (unlikely(!file))
return;
/* Note: preempt is already disabled around the kprobe handler */
while (*file) {
__kprobe_trace_func(tp, regs, *file);
file++;
@ -925,9 +945,16 @@ static __kprobes void
kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
struct pt_regs *regs)
{
struct ftrace_event_file **file = tp->files;
/*
* Note: preempt is already disabled around the kprobe handler.
* However, we still need an smp_read_barrier_depends() corresponding
* to smp_wmb() in rcu_assign_pointer() to access the pointer.
*/
struct ftrace_event_file **file = rcu_dereference_raw(tp->files);
if (unlikely(!file))
return;
/* Note: preempt is already disabled around the kprobe handler */
while (*file) {
__kretprobe_trace_func(tp, ri, regs, *file);
file++;
@ -935,7 +962,7 @@ kretprobe_trace_func(struct trace_probe *tp, struct kretprobe_instance *ri,
}
/* Event entry printers */
enum print_line_t
static enum print_line_t
print_kprobe_event(struct trace_iterator *iter, int flags,
struct trace_event *event)
{
@ -971,7 +998,7 @@ partial:
return TRACE_TYPE_PARTIAL_LINE;
}
enum print_line_t
static enum print_line_t
print_kretprobe_event(struct trace_iterator *iter, int flags,
struct trace_event *event)
{