tracing: Don't inc err_log entry count if entry allocation fails

commit 67ab5eb71b37b55f7c5522d080a1b42823351776 upstream.

tr->n_err_log_entries should only be increased if entry allocation
succeeds.

Doing it when it fails won't cause any problems other than wasting an
entry, but should be fixed anyway.

Link: https://lkml.kernel.org/r/cad1ab28f75968db0f466925e7cba5970cec6c29.1643319703.git.zanussi@kernel.org
Cc: stable@vger.kernel.org
Fixes: 2f754e771b1a6 ("tracing: Don't inc err_log entry count if entry allocation fails")
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ce05ba0..51a87a6 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -7749,7 +7749,8 @@ static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)
                err = kzalloc(sizeof(*err), GFP_KERNEL);
                if (!err)
                        err = ERR_PTR(-ENOMEM);
-               tr->n_err_log_entries++;
+               else
+                       tr->n_err_log_entries++;
 
                return err;
        }