linux-kernel - [PATCH 094/270] libceph: fix overflow in osdmap_apply

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Date:	Mon, 26 Nov 2012 14:56:24 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Xi Wang <xi.wang@...il.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 094/270] libceph: fix overflow in osdmap_apply_incremental()

3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit a5506049500b30dbc5edb4d07a3577477c1f3643 upstream.

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@...il.com>
Reviewed-by: Alex Elder <elder@...tank.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 net/ceph/osdmap.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index bc73341..9600674 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -893,6 +893,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 			(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;
-- 
1.7.9.5

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