From: Ilya Dryomov Date: Mon, 29 Jun 2015 16:30:23 +0000 (+0300) Subject: crush: fix a bug in tree bucket decode X-Git-Tag: firefly_0821_release~176^2~1491^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=82cd003a77173c91b9acad8033fb7931dac8d751;p=firefly-linux-kernel-4.4.55.git crush: fix a bug in tree bucket decode struct crush_bucket_tree::num_nodes is u8, so ceph_decode_8_safe() should be used. -Wconversion catches this, but I guess it went unnoticed in all the noise it spews. The actual problem (at least for common crushmaps) isn't the u32 -> u8 truncation though - it's the advancement by 4 bytes instead of 1 in the crushmap buffer. Fixes: http://tracker.ceph.com/issues/2759 Cc: stable@vger.kernel.org Signed-off-by: Ilya Dryomov Reviewed-by: Josh Durgin --- diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c index 15796696d64e..4a3125836b64 100644 --- a/net/ceph/osdmap.c +++ b/net/ceph/osdmap.c @@ -89,7 +89,7 @@ static int crush_decode_tree_bucket(void **p, void *end, { int j; dout("crush_decode_tree_bucket %p to %p\n", *p, end); - ceph_decode_32_safe(p, end, b->num_nodes, bad); + ceph_decode_8_safe(p, end, b->num_nodes, bad); b->node_weights = kcalloc(b->num_nodes, sizeof(u32), GFP_NOFS); if (b->node_weights == NULL) return -ENOMEM;