linux-kernel - [PATCH] firewire: nosy: Fix dma_free

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Message-ID: <20251216165420.38355-2-fourier.thomas@gmail.com>
Date: Tue, 16 Dec 2025 17:54:18 +0100
From: Thomas Fourier <fourier.thomas@...il.com>
To: 
Cc: Thomas Fourier <fourier.thomas@...il.com>,
	Takashi Sakamoto <o-takashi@...amocchi.jp>,
	Kristian Høgsberg <krh@...planet.net>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH] firewire: nosy: Fix dma_free_coherent() size

It looks like the buffer allocated and mapped in add_card() is done
with size RCV_BUFFER_SIZE which is 16 KB and 4KB.

Fixes: 286468210d83 ("firewire: new driver: nosy - IEEE 1394 traffic sniffer")
Signed-off-by: Thomas Fourier <fourier.thomas@...il.com>
---
 drivers/firewire/nosy.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
index ea31ac7ac1ca..f562e82e5438 100644
--- a/drivers/firewire/nosy.c
+++ b/drivers/firewire/nosy.c
@@ -494,6 +494,8 @@ irq_handler(int irq, void *device)
 	return IRQ_HANDLED;
 }
 
+#define RCV_BUFFER_SIZE (16 * 1024)
+
 static void
 remove_card(struct pci_dev *dev)
 {
@@ -517,16 +519,14 @@ remove_card(struct pci_dev *dev)
 			  lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
 	dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
 			  lynx->rcv_pcl, lynx->rcv_pcl_bus);
-	dma_free_coherent(&lynx->pci_device->dev, PAGE_SIZE, lynx->rcv_buffer,
-			  lynx->rcv_buffer_bus);
+	dma_free_coherent(&lynx->pci_device->dev, RCV_BUFFER_SIZE,
+			  lynx->rcv_buffer, lynx->rcv_buffer_bus);
 
 	iounmap(lynx->registers);
 	pci_disable_device(dev);
 	lynx_put(lynx);
 }
 
-#define RCV_BUFFER_SIZE (16 * 1024)
-
 static int
 add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 {
@@ -680,7 +680,7 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 		dma_free_coherent(&lynx->pci_device->dev, sizeof(struct pcl),
 				  lynx->rcv_pcl, lynx->rcv_pcl_bus);
 	if (lynx->rcv_buffer)
-		dma_free_coherent(&lynx->pci_device->dev, PAGE_SIZE,
+		dma_free_coherent(&lynx->pci_device->dev, RCV_BUFFER_SIZE,
 				  lynx->rcv_buffer, lynx->rcv_buffer_bus);
 	iounmap(lynx->registers);
 
-- 
2.43.0