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usb: yurex: fix race in probe

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The bbu member of the descriptor must be set to the value
standing for uninitialized values before the URB whose
completion handler sets bbu is submitted. Otherwise there is
a window during which probing can overwrite already retrieved
data.

Cc: stable <stable@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://patch.msgid.link/20260209143720.1507500-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum
2026-02-09 15:37:20 +01:00
committed by Greg Kroah-Hartman
parent 0d6c8144ca
commit 7a875c0989
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/misc/yurex.c
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@@ -272,6 +272,7 @@ static int yurex_probe(struct usb_interface *interface, const struct usb_device_
dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
dev, 1);
dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
dev->bbu = -1;
if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
retval = -EIO;
dev_err(&interface->dev, "Could not submitting URB\n");
@@ -280,7 +281,6 @@ static int yurex_probe(struct usb_interface *interface, const struct usb_device_
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);
dev->bbu = -1;
/* we can register the device now, as it is ready */
retval = usb_register_dev(interface, &yurex_class);