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| author | Artem Savkov <asavkov@redhat.com> | 2018-07-25 16:20:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-09 12:20:25 +0200 |
| commit | 15165b72aa41f623e1519e03e5e1de9ee92cad73 (patch) | |
| tree | bf334596ad2ac540f20e76e3f9eb96ea58704e02 /kernel | |
| parent | 606ce67d88427994b5add25c0ab27bb4ccd44cd9 (diff) | |
| download | linux-stable-15165b72aa41f623e1519e03e5e1de9ee92cad73.tar.gz linux-stable-15165b72aa41f623e1519e03e5e1de9ee92cad73.tar.bz2 linux-stable-15165b72aa41f623e1519e03e5e1de9ee92cad73.zip | |
tracing/kprobes: Fix trace_probe flags on enable_trace_kprobe() failure
commit 57ea2a34adf40f3a6e88409aafcf803b8945619a upstream.
If enable_trace_kprobe fails to enable the probe in enable_k(ret)probe
it returns an error, but does not unset the tp flags it set previously.
This results in a probe being considered enabled and failures like being
unable to remove the probe through kprobe_events file since probes_open()
expects every probe to be disabled.
Link: http://lkml.kernel.org/r/20180725102826.8300-1-asavkov@redhat.com
Link: http://lkml.kernel.org/r/20180725142038.4765-1-asavkov@redhat.com
Cc: Ingo Molnar <mingo@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 41a7dd420c57 ("tracing/kprobes: Support ftrace_event_file base multibuffer")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Artem Savkov <asavkov@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_kprobe.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 46f2db093360..669609756720 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -361,11 +361,10 @@ static struct trace_kprobe *find_trace_kprobe(const char *event, static int enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file) { + struct event_file_link *link; int ret = 0; if (file) { - struct event_file_link *link; - link = kmalloc(sizeof(*link), GFP_KERNEL); if (!link) { ret = -ENOMEM; @@ -385,6 +384,16 @@ enable_trace_kprobe(struct trace_kprobe *tk, struct ftrace_event_file *file) else ret = enable_kprobe(&tk->rp.kp); } + + if (ret) { + if (file) { + list_del_rcu(&link->list); + kfree(link); + tk->tp.flags &= ~TP_FLAG_TRACE; + } else { + tk->tp.flags &= ~TP_FLAG_PROFILE; + } + } out: return ret; } |