uprobe_perf_open()->uprobe_apply() can fail, but this error is wrongly
ignored. Change uprobe_perf_open() to do uprobe_perf_close() and return
the error code in this case.
Change uprobe_perf_close() to propogate the error from uprobe_apply()
as well, although it should not fail.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
Acked-by: Steven Rostedt <rost...@goodmis.org>
Acked-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
---
kernel/trace/trace_uprobe.c | 14 +++++++++-----
1 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 1ed0030..9aad3e2 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -1020,7 +1020,7 @@ static int uprobe_perf_close(struct trace_uprobe *tu,
struct perf_event *event)
write_unlock(&tu->filter.rwlock);
if (!done)
- uprobe_apply(tu->inode, tu->offset, &tu->consumer, false);
+ return uprobe_apply(tu->inode, tu->offset, &tu->consumer,
false);
return 0;
}
@@ -1028,6 +1028,7 @@ static int uprobe_perf_close(struct trace_uprobe *tu,
struct perf_event *event)
static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event)
{
bool done;
+ int err;
write_lock(&tu->filter.rwlock);
if (event->hw.tp_target) {
@@ -1049,10 +1050,13 @@ static int uprobe_perf_open(struct trace_uprobe *tu,
struct perf_event *event)
}
write_unlock(&tu->filter.rwlock);
- if (!done)
- uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
-
- return 0;
+ err = 0;
+ if (!done) {
+ err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true);
+ if (err)
+ uprobe_perf_close(tu, event);
+ }
+ return err;
}
static bool uprobe_perf_filter(struct uprobe_consumer *uc,
--
1.5.5.1
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