From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> From: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> commit 6801854be94fe8819b3894979875ea31482f5658 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/387a670316002324113ac7ea1e8b53f4085d0c95.1615171203.git.skhan@xxxxxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/usbip/vudc_sysfs.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/drivers/usb/usbip/vudc_sysfs.c +++ b/drivers/usb/usbip/vudc_sysfs.c @@ -12,6 +12,7 @@ #include <linux/usb/ch9.h> #include <linux/sysfs.h> #include <linux/kthread.h> +#include <linux/file.h> #include <linux/byteorder/generic.h> #include "usbip_common.h" @@ -138,6 +139,13 @@ static ssize_t usbip_sockfd_store(struct goto unlock_ud; } + if (socket->type != SOCK_STREAM) { + dev_err(dev, "Expecting SOCK_STREAM - found %d", + socket->type); + ret = -EINVAL; + goto sock_err; + } + udc->ud.tcp_socket = socket; spin_unlock_irq(&udc->ud.lock); @@ -177,6 +185,8 @@ static ssize_t usbip_sockfd_store(struct return count; +sock_err: + sockfd_put(socket); unlock_ud: spin_unlock_irq(&udc->ud.lock); unlock:
