From 9902e682c7f3df9ed5f60bc6f9c7efa6fd6b2d1d Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <ilya.dryomov@inktank.com>
Date: Thu, 13 Mar 2014 16:36:15 +0200
Subject: libceph: fix crush_decode() call site in osdmap_decode()
The size of the memory area feeded to crush_decode() should be limited
not only by osdmap end, but also by the crush map length. Also, drop
unnecessary dout() (dout() in crush_decode() conveys the same info) and
step past crush map only if it is decoded successfully.
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>
---
net/ceph/osdmap.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
(limited to 'net/ceph')
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index c39ac624ccc3..d4a6b0df3627 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -802,16 +802,13 @@ static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
/* crush */
ceph_decode_32_safe(p, end, len, e_inval);
- dout("osdmap_decode crush len %d from off 0x%x\n", len,
- (int)(*p - start));
- ceph_decode_need(p, end, len, e_inval);
- map->crush = crush_decode(*p, end);
- *p += len;
+ map->crush = crush_decode(*p, min(*p + len, end));
if (IS_ERR(map->crush)) {
err = PTR_ERR(map->crush);
map->crush = NULL;
goto bad;
}
+ *p += len;
/* ignore the rest */
*p = end;
--
cgit