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

------------------

From: Xi Wang <xi.wang@gmail.com>

(cherry picked from commit a5506049500b30dbc5edb4d07a3577477c1f3643)

On 32-bit systems, a large `pglen' would overflow `pglen*sizeof(u32)'
and bypass the check ceph_decode_need(p, end, pglen*sizeof(u32), bad).
It would also overflow the subsequent kmalloc() size, leading to
out-of-bounds write.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Alex Elder <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ceph/osdmap.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c

@@ -900,6 +900,10 @@ struct ceph_osdmap *osdmap_apply_increme
 			(void) __remove_pg_mapping(&map->pg_temp, pgid);
 
 			/* insert */
+			if (pglen > (UINT_MAX - sizeof(*pg)) / sizeof(u32)) {
+				err = -EINVAL;
+				goto bad;
+			}
 			pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS);
 			if (!pg) {
 				err = -ENOMEM;