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libceph: fix crush_decode() call site in osdmap_decode()

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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>
This commit is contained in:
Ilya Dryomov 2014-03-13 16:36:15 +02:00 committed by Sage Weil
parent 2d88b2e081
commit 9902e682c7
1 changed files with 2 additions and 5 deletions
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7
net/ceph/osdmap.c
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@ -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;