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nbd/server: add additional assert to nbd_export_put 

This place is not obvious, nbd_export_close may theoretically reduce
refcount to 0. It may happen if someone calls nbd_export_put on named
export not through nbd_export_set_name when refcount is 1.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20171207155102.66622-2-vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2017-12-07 18:50:57 +03:00 committed by Eric Blake
parent 3cee4db661
commit 9156245ec4
1 changed files with 6 additions and 0 deletions
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6
nbd/server.c
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@ -1190,6 +1190,12 @@ void nbd_export_put(NBDExport *exp)
nbd_export_close(exp);
}
/* nbd_export_close() may theoretically reduce refcount to 0. It may happen
* if someone calls nbd_export_put() on named export not through
* nbd_export_set_name() when refcount is 1. So, let's assert that
* it is > 0.
*/
assert(exp->refcount > 0);
if (--exp->refcount == 0) {
assert(exp->name == NULL);
assert(exp->description == NULL);