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trace/blktrace: fix memory leak with using debugfs_lookup() 

[ Upstream commit 83e8864fee ]

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>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230202141956.2299521-1-gregkh@linuxfoundation.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Greg Kroah-Hartman 2023-02-02 15:19:56 +01:00
parent 81c1188905
commit 3036f5f5ae
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/blktrace.c
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@ -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. * under 'q->debugfs_dir', thus lookup and remove them.
*/ */
if (!bt->dir) { if (!bt->dir) {
debugfs_remove(debugfs_lookup("dropped", q->debugfs_dir)); debugfs_lookup_and_remove("dropped", q->debugfs_dir);
debugfs_remove(debugfs_lookup("msg", q->debugfs_dir)); debugfs_lookup_and_remove("msg", q->debugfs_dir);
} else { } else {
debugfs_remove(bt->dir); debugfs_remove(bt->dir);
} }