[RFC v1 01/19] uprobes: guard trace cleanup against error pointers

[Andi Kleen <ak@kernel.org>]

Sashiko pointed out the some of the scope cleanups for free_uprobe
could get an error pointer. Handle this case in free_uprobe
to prevent a crash.

On the other hand the macro doesn't need the guard because
free_uprobe itself already does the check.

Assisted-by: omp:gpt-5.6-luna sashiko
Signed-off-by: Andi Kleen <ak@kernel.org>
---
 kernel/trace/trace_uprobe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 861d857adadb..22cc3c8181b8 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -368,7 +368,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
 
 static void free_trace_uprobe(struct trace_uprobe *tu)
 {
-	if (!tu)
+	if (IS_ERR_OR_NULL(tu))
 		return;
 
 	path_put(&tu->path);
@@ -533,7 +533,7 @@ static int register_trace_uprobe(struct trace_uprobe *tu)
 	return ret;
 }
 
-DEFINE_FREE(free_trace_uprobe, struct trace_uprobe *, if (_T) free_trace_uprobe(_T))
+DEFINE_FREE(free_trace_uprobe, struct trace_uprobe *, free_trace_uprobe(_T))
 
 /*
  * Argument syntax:
-- 
2.54.0