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libceph: allow addrvecs with a single NONE/blank address 

Normally, an unused OSD id/slot is represented by an empty addrvec.
However, it also appears to be possible to generate an osdmap where
an unused OSD id/slot has an addrvec with a single blank address of
type NONE.  Allow such addrvecs and make the end result be exactly
the same as for the empty addrvec case -- leave addr intact.

Cc: stable@vger.kernel.org # 5.11+
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Ilya Dryomov 2021-05-03 17:09:01 +02:00
parent 61ca49a910
commit 3f1c6f2122
1 changed files with 14 additions and 6 deletions
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20
net/ceph/decode.c
View File

@ -4,6 +4,7 @@
#include <linux/inet.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/messenger.h> /* for ceph_pr_addr() */
static int
ceph_decode_entity_addr_versioned(void **p, void *end,
@ -110,6 +111,7 @@ int ceph_decode_entity_addrvec(void **p, void *end, bool msgr2,
}
ceph_decode_32_safe(p, end, addr_cnt, e_inval);
dout("%s addr_cnt %d\n", __func__, addr_cnt);
found = false;
for (i = 0; i < addr_cnt; i++) {
@ -117,6 +119,7 @@ int ceph_decode_entity_addrvec(void **p, void *end, bool msgr2,
if (ret)
return ret;
dout("%s i %d addr %s\n", __func__, i, ceph_pr_addr(&tmp_addr));
if (tmp_addr.type == my_type) {
if (found) {
pr_err("another match of type %d in addrvec\n",
@ -128,13 +131,18 @@ int ceph_decode_entity_addrvec(void **p, void *end, bool msgr2,
found = true;
}
}
if (!found && addr_cnt != 0) {
pr_err("no match of type %d in addrvec\n",
le32_to_cpu(my_type));
return -ENOENT;
}
return 0;
if (found)
return 0;
if (!addr_cnt)
return 0; /* normal -- e.g. unused OSD id/slot */
if (addr_cnt == 1 && !memchr_inv(&tmp_addr, 0, sizeof(tmp_addr)))
return 0; /* weird but effectively the same as !addr_cnt */
pr_err("no match of type %d in addrvec\n", le32_to_cpu(my_type));
return -ENOENT;
e_inval:
return -EINVAL;