linux-kernel - [PATCH 2/8] drbd: fix DRBD_VOLUME

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Date:   Fri,  9 Dec 2022 15:53:21 +0100
From:   Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        linux-block@...r.kernel.org,
        Robert Altnoeder <robert.altnoeder@...bit.com>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>,
        Joel Colledge <joel.colledge@...bit.com>
Subject: [PATCH 2/8] drbd: fix DRBD_VOLUME_MAX 65535 -> 65534

From: Robert Altnoeder <robert.altnoeder@...bit.com>

The protocol uses -1 as a reserved value for
'no specific volume', and since the protocol field
is a 16 bit unsigned value, -1 is converted to
65535. Therefore, limit the range of valid volume
numbers to [0, 65534].

Signed-off-by: Robert Altnoeder <robert.altnoeder@...bit.com>
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@...bit.com>
Reviewed-by: Joel Colledge <joel.colledge@...bit.com>
---
 include/linux/drbd_limits.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/drbd_limits.h b/include/linux/drbd_limits.h
index d64271ccece4..058f7600f79c 100644
--- a/include/linux/drbd_limits.h
+++ b/include/linux/drbd_limits.h
@@ -21,7 +21,7 @@
 #define DRBD_MINOR_COUNT_DEF 32
 #define DRBD_MINOR_COUNT_SCALE '1'
 
-#define DRBD_VOLUME_MAX 65535
+#define DRBD_VOLUME_MAX 65534
 
 #define DRBD_DIALOG_REFRESH_MIN 0
 #define DRBD_DIALOG_REFRESH_MAX 600
-- 
2.38.1