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authorOleg Nesterov <oleg@redhat.com>2013-07-23 17:26:00 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-29 09:47:32 -0700
commit92b6279e284257fb7908bf4d24956f5af13aaa2d (patch)
tree1c29b4616adc1d8a979fd56c1aac3d777c443756
parent23b625fa111e7358ce84672c4444c068b2b1e204 (diff)
downloadvexpress-lsk-92b6279e284257fb7908bf4d24956f5af13aaa2d.tar.gz
tracing: Change tracing_buffers_fops to rely on tracing_get_cpu()
commit 46ef2be0d1d5ccea0c41bb606143586daadd537c upstream. tracing_buffers_open() is racy, the memory inode->i_private points to can be already freed. Change debugfs_create_file("trace_pipe_raw", data) caller to pass "data = tr", tracing_buffers_open() can use tracing_get_cpu(). Change debugfs_create_file("snapshot_raw_fops", data) caller too, this file uses tracing_buffers_open/release. Link: http://lkml.kernel.org/r/20130723152600.GA23720@redhat.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--kernel/trace/trace.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8e8bb0e2548..7dcd67332f5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4941,8 +4941,7 @@ static const struct file_operations snapshot_raw_fops = {
static int tracing_buffers_open(struct inode *inode, struct file *filp)
{
- struct trace_cpu *tc = inode->i_private;
- struct trace_array *tr = tc->tr;
+ struct trace_array *tr = inode->i_private;
struct ftrace_buffer_info *info;
int ret;
@@ -4961,7 +4960,7 @@ static int tracing_buffers_open(struct inode *inode, struct file *filp)
mutex_lock(&trace_types_lock);
info->iter.tr = tr;
- info->iter.cpu_file = tc->cpu;
+ info->iter.cpu_file = tracing_get_cpu(inode);
info->iter.trace = tr->current_trace;
info->iter.trace_buffer = &tr->trace_buffer;
info->spare = NULL;
@@ -5568,7 +5567,7 @@ tracing_init_debugfs_percpu(struct trace_array *tr, long cpu)
&data->trace_cpu, cpu, &tracing_fops);
trace_create_cpu_file("trace_pipe_raw", 0444, d_cpu,
- &data->trace_cpu, cpu, &tracing_buffers_fops);
+ tr, cpu, &tracing_buffers_fops);
trace_create_cpu_file("stats", 0444, d_cpu,
&data->trace_cpu, cpu, &tracing_stats_fops);
@@ -5581,7 +5580,7 @@ tracing_init_debugfs_percpu(struct trace_array *tr, long cpu)
&data->trace_cpu, cpu, &snapshot_fops);
trace_create_cpu_file("snapshot_raw", 0444, d_cpu,
- &data->trace_cpu, cpu, &snapshot_raw_fops);
+ tr, cpu, &snapshot_raw_fops);
#endif
}