[PATCH 3.12 097/123] crush: fix a bug in tree bucket decode

From: Jiri Slaby
Date: Tue Aug 04 2015 - 10:51:56 EST


From: Ilya Dryomov <idryomov@xxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit 82cd003a77173c91b9acad8033fb7931dac8d751 upstream.

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

Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Reviewed-by: Josh Durgin <jdurgin@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
net/ceph/osdmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index dbd9a4792427..7ec4e0522215 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;
--
2.5.0

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