Messages in this thread | | | Date | Sat, 4 Feb 2023 15:17:04 -0800 | Subject | Re: [PATCH] trace/blktrace: fix memory leak with using debugfs_lookup() | From | Bart Van Assche <> |
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On 2/2/23 06:19, Greg Kroah-Hartman wrote: > When calling debugfs_lookup() the result must have dput() called on it, > otherwise the memory will leak over time. To make things simpler, just > call debugfs_lookup_and_remove() instead which handles all of the logic > at once. > > Cc: Jens Axboe <axboe@kernel.dk> > Cc: Steven Rostedt <rostedt@goodmis.org> > Cc: Masami Hiramatsu <mhiramat@kernel.org> > Cc: linux-block@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Cc: linux-trace-kernel@vger.kernel.org > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > --- > kernel/trace/blktrace.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c > index 918a7d12df8f..5743be559415 100644 > --- a/kernel/trace/blktrace.c > +++ b/kernel/trace/blktrace.c > @@ -320,8 +320,8 @@ static void blk_trace_free(struct request_queue *q, struct blk_trace *bt) > * under 'q->debugfs_dir', thus lookup and remove them. > */ > if (!bt->dir) { > - debugfs_remove(debugfs_lookup("dropped", q->debugfs_dir)); > - debugfs_remove(debugfs_lookup("msg", q->debugfs_dir)); > + debugfs_lookup_and_remove("dropped", q->debugfs_dir); > + debugfs_lookup_and_remove("msg", q->debugfs_dir); > } else { > debugfs_remove(bt->dir); > }
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
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