crush: fix crash from invalid 'take' argument
Verify that the 'take' argument is a valid device or bucket.
Otherwise ignore it (do not add the value to the working vector).
Reflects ceph.git commit 9324d0a1af61e1c234cc48e2175b4e6320fff8f4.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index 5b47736..7568cb5 100644
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -790,8 +790,15 @@
switch (curstep->op) {
case CRUSH_RULE_TAKE:
- w[0] = curstep->arg1;
- wsize = 1;
+ if ((curstep->arg1 >= 0 &&
+ curstep->arg1 < map->max_devices) ||
+ (-1-curstep->arg1 < map->max_buckets &&
+ map->buckets[-1-curstep->arg1])) {
+ w[0] = curstep->arg1;
+ wsize = 1;
+ } else {
+ dprintk(" bad take value %d\n", curstep->arg1);
+ }
break;
case CRUSH_RULE_SET_CHOOSE_TRIES: