From: Greg KH <greg@xxxxxxxxx> We need to only copy the data received by the device to userspace, not the whole kernel buffer, which can contain "stale" data. Thanks to Marcus Meissner for pointing this out and testing the fix. Reported-by: Marcus Meissner <meissner@xxxxxxx> Tested-by: Marcus Meissner <meissner@xxxxxxx> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: stable <stable@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> --- drivers/usb/core/devio.c | 8 ++++---- 1 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 6e8bcdf..ca948bb 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1312,9 +1312,9 @@ static int processcompl(struct async *as, void __user * __user *arg) void __user *addr = as->userurb; unsigned int i; - if (as->userbuffer) + if (as->userbuffer && urb->actual_length) if (copy_to_user(as->userbuffer, urb->transfer_buffer, - urb->transfer_buffer_length)) + urb->actual_length)) goto err_out; if (put_user(as->status, &userurb->status)) goto err_out; @@ -1475,9 +1475,9 @@ static int processcompl_compat(struct async *as, void __user * __user *arg) void __user *addr = as->userurb; unsigned int i; - if (as->userbuffer) + if (as->userbuffer && urb->actual_length) if (copy_to_user(as->userbuffer, urb->transfer_buffer, - urb->transfer_buffer_length)) + urb->actual_length)) return -EFAULT; if (put_user(as->status, &userurb->status)) return -EFAULT; -- 1.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
