From: Johan Hovold <johan@xxxxxxxxxx> [ Upstream commit 88f6bf3846ee90bf33aa1ce848cd3bfb3229f4a4 ] A recent info-leak bug manifested itself along with warning about a negative buffer overflow: ldusb 1-1:0.28: Read buffer overflow, -131383859965943 bytes dropped when it was really a rather large positive one. A sanity check that prevents this has now been put in place, but let's fix up the size format specifiers, which should all be unsigned. Signed-off-by: Johan Hovold <johan@xxxxxxxxxx> Link: https://lore.kernel.org/r/20191022143203.5260-3-johan@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/usb/misc/ldusb.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c index f5e34c5034547..8f86b4ebca898 100644 --- a/drivers/usb/misc/ldusb.c +++ b/drivers/usb/misc/ldusb.c @@ -487,7 +487,7 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count, } bytes_to_read = min(count, *actual_buffer); if (bytes_to_read < *actual_buffer) - dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n", + dev_warn(&dev->intf->dev, "Read buffer overflow, %zu bytes dropped\n", *actual_buffer-bytes_to_read); /* copy one interrupt_in_buffer from ring_buffer into userspace */ @@ -562,8 +562,9 @@ static ssize_t ld_usb_write(struct file *file, const char __user *buffer, /* write the data into interrupt_out_buffer from userspace */ bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size); if (bytes_to_write < count) - dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n", count-bytes_to_write); - dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n", + dev_warn(&dev->intf->dev, "Write buffer overflow, %zu bytes dropped\n", + count - bytes_to_write); + dev_dbg(&dev->intf->dev, "%s: count = %zu, bytes_to_write = %zu\n", __func__, count, bytes_to_write); if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) { -- 2.20.1
