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authorIlya Dryomov <idryomov@gmail.com>2015-06-29 19:30:23 +0300
committerIlya Dryomov <idryomov@gmail.com>2015-07-01 00:46:35 +0300
commit82cd003a77173c91b9acad8033fb7931dac8d751 (patch)
tree8c5f6e866c107968ebfdc95e7de8fba62b76d89e /net/ceph
parentc2cfa19400979dc1a14bba75f83b451b0cd9507a (diff)
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 <idryomov@gmail.com> Reviewed-by: Josh Durgin <jdurgin@redhat.com>
Diffstat (limited to 'net/ceph')
-rw-r--r--net/ceph/osdmap.c2
1 files changed, 1 insertions, 1 deletions
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;

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