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pvcalls-front: don't try to free unallocated rings 

inflight_req_id is 0 when initialized. If inflight_req_id is 0, there is
no accept_map to free. Fix the check in pvcalls_front_release.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Stefano Stabellini 2018-12-21 15:06:30 -08:00 committed by Boris Ostrovsky
parent b79470b64f
commit 96283f9a08
1 changed files with 2 additions and 2 deletions
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4
drivers/xen/pvcalls-front.c
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@ -1030,8 +1030,8 @@ int pvcalls_front_release(struct socket *sock)
spin_lock(&bedata->socket_lock); spin_lock(&bedata->socket_lock);
list_del(&map->list); list_del(&map->list);
spin_unlock(&bedata->socket_lock); spin_unlock(&bedata->socket_lock);
if (READ_ONCE(map->passive.inflight_req_id) != if (READ_ONCE(map->passive.inflight_req_id) != PVCALLS_INVALID_ID &&
PVCALLS_INVALID_ID) { READ_ONCE(map->passive.inflight_req_id) != 0) {
pvcalls_front_free_map(bedata, pvcalls_front_free_map(bedata,
map->passive.accept_map); map->passive.accept_map);
} }