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| author | Ilya Dryomov <idryomov@gmail.com> | 2015-06-29 19:30:23 +0300 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2015-07-01 00:46:35 +0300 |
| commit | 82cd003a77173c91b9acad8033fb7931dac8d751 (patch) | |
| tree | 8c5f6e866c107968ebfdc95e7de8fba62b76d89e /net/ceph | |
| parent | c2cfa19400979dc1a14bba75f83b451b0cd9507a (diff) | |
| download | lwn-82cd003a77173c91b9acad8033fb7931dac8d751.tar.gz lwn-82cd003a77173c91b9acad8033fb7931dac8d751.zip | |
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.c | 2 |
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; |