linux-kernel - [ 113/171] libceph: fix overflow in osdmap_apply

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Date:	Wed, 21 Nov 2012 16:40:59 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Xi Wang <xi.wang@...il.com>,
	Alex Elder <elder@...tank.com>
Subject: [ 113/171] libceph: fix overflow in osdmap_apply_incremental()

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

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

From: Xi Wang <xi.wang@...il.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@...il.com>
Reviewed-by: Alex Elder <elder@...tank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;


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