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xen/xenbus: fix overflow check in xenbus_file_write()

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Acked-by: Ian Campbell <ian.campbell@citrix.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
[v1: Rebased on upstream]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jan Beulich 2012-10-17 13:14:09 -04:00 committed by Konrad Rzeszutek Wilk
parent 2ebb939ab9
commit 1bcaba51eb
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/xenbus/xenbus_dev_frontend.c
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@ -458,7 +458,7 @@ static ssize_t xenbus_file_write(struct file *filp,
goto out; goto out;
/* Can't write a xenbus message larger we can buffer */ /* Can't write a xenbus message larger we can buffer */
if ((len + u->len) > sizeof(u->u.buffer)) { if (len > sizeof(u->u.buffer) - u->len) {
/* On error, dump existing buffer */ /* On error, dump existing buffer */
u->len = 0; u->len = 0;
rc = -EINVAL; rc = -EINVAL;