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tracing: Fix return while holding a lock in register_tracer() 

commit d39cdd2036 ("tracing: Make tracer_flags use the right set_flag
callback")  introduces a potential mutex deadlock issue, as it forgets to
free the mutex when allocaing the tracer_flags gets fail.

The issue was found by Dan Carpenter through Smatch static code check tool.

Link: http://lkml.kernel.org/r/1457958941-30265-1-git-send-email-chuhu@redhat.com

Fixes: d39cdd2036 ("tracing: Make tracer_flags use the right set_flag callback")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Chunyu Hu 2016-03-14 20:35:41 +08:00 committed by Steven Rostedt
parent 6363c6b599
commit c8ca003b2f
1 changed files with 4 additions and 2 deletions
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6
kernel/trace/trace.c
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@ -1256,8 +1256,10 @@ int __init register_tracer(struct tracer *type)
if (!type->flags) { if (!type->flags) {
/*allocate a dummy tracer_flags*/ /*allocate a dummy tracer_flags*/
type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL); type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
if (!type->flags) if (!type->flags) {
return -ENOMEM; ret = -ENOMEM;
goto out;
}
type->flags->val = 0; type->flags->val = 0;
type->flags->opts = dummy_tracer_opt; type->flags->opts = dummy_tracer_opt;
} else } else