From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED11E882C for ; Fri, 10 Mar 2023 15:16:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5633EC433D2; Fri, 10 Mar 2023 15:16:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678461412; bh=ng/AWsp3f23QHE9jW9WRe+LRsRvjsziup0qvPOmGWlY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wVXU+vvR6MZTr2bBX/zTadEIC3XREZH+knZ1sy1H7Qrzd0FNwf2MzrZWBFRPlYKk6 p/dBGCkw01aXgJa+TwySJ3L0rqGEzBS2EIbMMO5nn6jhgaB+54eySusm90SlvAFwgT 9YlLTpfvZtm4SpStLUYRocWHo53WmiUhH2ajyYfA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alan Stern , Sasha Levin Subject: [PATCH 5.15 098/136] USB: uhci: fix memory leak with using debugfs_lookup() Date: Fri, 10 Mar 2023 14:43:40 +0100 Message-Id: <20230310133710.121753965@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133706.811226272@linuxfoundation.org> References: <20230310133706.811226272@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman [ Upstream commit 0a3f82c79c86278e7f144564b1cb6cc5c3657144 ] 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: Alan Stern Link: https://lore.kernel.org/r/20230202153235.2412790-3-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/host/uhci-hcd.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index d90b869f5f409..d138f62ce84d7 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -536,8 +536,8 @@ static void release_uhci(struct uhci_hcd *uhci) uhci->is_initialized = 0; spin_unlock_irq(&uhci->lock); - debugfs_remove(debugfs_lookup(uhci_to_hcd(uhci)->self.bus_name, - uhci_debugfs_root)); + debugfs_lookup_and_remove(uhci_to_hcd(uhci)->self.bus_name, + uhci_debugfs_root); for (i = 0; i < UHCI_NUM_SKELQH; i++) uhci_free_qh(uhci, uhci->skelqh[i]); @@ -700,7 +700,7 @@ static int uhci_start(struct usb_hcd *hcd) uhci->frame, uhci->frame_dma_handle); err_alloc_frame: - debugfs_remove(debugfs_lookup(hcd->self.bus_name, uhci_debugfs_root)); + debugfs_lookup_and_remove(hcd->self.bus_name, uhci_debugfs_root); return retval; } -- 2.39.2