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Subject[PATCH 5.11 214/306] usbip: fix vudc to check for stream socket
Date
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

From: Shuah Khan <skhan@linuxfoundation.org>

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@vger.kernel.org
Suggested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/387a670316002324113ac7ea1e8b53f4085d0c95.1615171203.git.skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/usbip/vudc_sysfs.c | 9 +++++++++
1 file changed, 9 insertions(+)

--- a/drivers/usb/usbip/vudc_sysfs.c
+++ b/drivers/usb/usbip/vudc_sysfs.c
@@ -138,6 +138,13 @@ 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 +184,8 @@ static ssize_t usbip_sockfd_store(struct

return count;

+sock_err:
+ sockfd_put(socket);
unlock_ud:
spin_unlock_irq(&udc->ud.lock);
unlock:

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