This is a note to let you know that I've just added the patch titled
crush: fix a bug in tree bucket decode
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crush-fix-a-bug-in-tree-bucket-decode.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 82cd003a77173c91b9acad8033fb7931dac8d751 Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <[email protected]>
Date: Mon, 29 Jun 2015 19:30:23 +0300
Subject: crush: fix a bug in tree bucket decode
From: Ilya Dryomov <[email protected]>
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 <[email protected]>
Reviewed-by: Josh Durgin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/ceph/osdmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -89,7 +89,7 @@ static int crush_decode_tree_bucket(void
{
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;
Patches currently in stable-queue which might be from [email protected] are
queue-4.1/crush-fix-a-bug-in-tree-bucket-decode.patch
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