libceph: safely decode max_osd value in osdmap_decode()

max_osd value is not covered by any ceph_decode_need().  Use a safe
version of ceph_decode_* macro to decode it.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 298d076eee89..ec06010657b3 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -687,9 +687,10 @@ static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
 {
         u16 version;
-        u32 len, max, i;
         u32 epoch = 0;
         void *start = *p;
+        u32 max;
+        u32 len, i;
         int err;
         struct ceph_pg_pool_info *pi;
 
@@ -736,7 +737,8 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
 
         ceph_decode_32_safe(p, end, map->flags, e_inval);
 
-        max = ceph_decode_32(p);
+        /* max_osd */
+        ceph_decode_32_safe(p, end, max, e_inval);
 
         /* (re)alloc osd arrays */
         err = osdmap_set_max_osd(map, max);