4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 37bb5628379295c1254c113a407cab03a0f4d0b4 upstream.
The "dev_dbg(&urb->dev->dev, ..." which happens after usb_free_urb(urb)
is a use after free of the "urb" pointer. Store the "dev" pointer at the
start of the function to avoid this issue.
Fixes: 984f68683298 ("USB: serial: io_edgeport.c: remove dbg() usage")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/serial/io_edgeport.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -846,11 +846,12 @@ static void edge_bulk_out_data_callback(
static void edge_bulk_out_cmd_callback(struct urb *urb)
{
struct edgeport_port *edge_port = urb->context;
+ struct device *dev = &urb->dev->dev;
int status = urb->status;
atomic_dec(&CmdUrbs);
- dev_dbg(&urb->dev->dev, "%s - FREE URB %p (outstanding %d)\n",
- __func__, urb, atomic_read(&CmdUrbs));
+ dev_dbg(dev, "%s - FREE URB %p (outstanding %d)\n", __func__, urb,
+ atomic_read(&CmdUrbs));
/* clean up the transfer buffer */
@@ -860,8 +861,7 @@ static void edge_bulk_out_cmd_callback(s
usb_free_urb(urb);
if (status) {
- dev_dbg(&urb->dev->dev,
- "%s - nonzero write bulk status received: %d\n",
+ dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
__func__, status);
return;
}
