From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> From: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> commit 47ccc8fc2c9c94558b27b6f9e2582df32d29e6e8 upstream. Fix usbip_sockfd_store() to validate the passed in file descriptor is a stream socket. If the file descriptor passed was a SOCK_DGRAM socket, sock_recvmsg() can't detect end of stream. Cc: stable@xxxxxxxxxxxxxxx Suggested-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/e942d2bd03afb8e8552bd2a5d84e18d17670d521.1615171203.git.skhan@xxxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/usbip/stub_dev.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) --- a/drivers/usb/usbip/stub_dev.c +++ b/drivers/usb/usbip/stub_dev.c @@ -69,8 +69,16 @@ static ssize_t usbip_sockfd_store(struct } socket = sockfd_lookup(sockfd, &err); - if (!socket) + if (!socket) { + dev_err(dev, "failed to lookup sock"); goto err; + } + + if (socket->type != SOCK_STREAM) { + dev_err(dev, "Expecting SOCK_STREAM - found %d", + socket->type); + goto sock_err; + } sdev->ud.tcp_socket = socket; sdev->ud.sockfd = sockfd; @@ -100,6 +108,8 @@ static ssize_t usbip_sockfd_store(struct return count; +sock_err: + sockfd_put(socket); err: spin_unlock_irq(&sdev->ud.lock); return -EINVAL;
