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xen/pvcalls: check for xenbus_read() errors

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Smatch complains that "len" is uninitialized if xenbus_read() fails so
let's add some error handling.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Dan Carpenter 2017-12-05 17:38:43 +03:00 committed by Boris Ostrovsky
parent 646d944c2e
commit 8c71fa88f7
1 changed files with 2 additions and 0 deletions
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2
drivers/xen/pvcalls-front.c
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@ -1128,6 +1128,8 @@ static int pvcalls_front_probe(struct xenbus_device *dev,
}
versions = xenbus_read(XBT_NIL, dev->otherend, "versions", &len);
if (IS_ERR(versions))
return PTR_ERR(versions);
if (!len)
return -EINVAL;
if (strcmp(versions, "1")) {