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Message-Id: <20210315135722.680996357@linuxfoundation.org>
Date: Mon, 15 Mar 2021 14:57:14 +0100
From: gregkh@...uxfoundation.org
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Shuah Khan <skhan@...uxfoundation.org>
Subject: [PATCH 4.19 083/120] usbip: fix stub_dev to check for stream socket
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
From: Shuah Khan <skhan@...uxfoundation.org>
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@...r.kernel.org
Suggested-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Link: https://lore.kernel.org/r/e942d2bd03afb8e8552bd2a5d84e18d17670d521.1615171203.git.skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
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;
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