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[Xen-devel] [PATCH] linux-2.6.18/blkfront: fix data size for xenbus_gath

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [PATCH] linux-2.6.18/blkfront: fix data size for xenbus_gather in connect()
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Fri, 06 May 2011 16:39:09 +0100
Cc: marmarek@xxxxxxxxxxxx
Delivery-date: Fri, 06 May 2011 08:39:47 -0700
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From: Marek Marczykowski <marmarek@xxxxxxxxxxxx>

barrier variable is int, not long. This overflow caused another variable
override: "err" (in PV code) and "binfo" (in xenlinux code -
drivers/xen/blkfront/blkfront.c). The later caused incorrect device
flags (RO/removable etc).

Signed-off-by: Marek Marczykowski <marmarek@xxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

--- a/drivers/xen/blkfront/blkfront.c
+++ b/drivers/xen/blkfront/blkfront.c
@@ -364,7 +364,7 @@ static void connect(struct blkfront_info
        err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
-                           "feature-barrier", "%lu", &info->feature_barrier,
+                           "feature-barrier", "%d", &info->feature_barrier,
        if (err)
                info->feature_barrier = 0;

Attachment: xen-blkfront-barrier-var.patch
Description: Text document

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