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Diffstat (limited to 'fs/ceph/mdsmap.c')
-rw-r--r--fs/ceph/mdsmap.c43
1 files changed, 34 insertions, 9 deletions
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 261531e55..8c3591a7f 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -54,16 +54,21 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
const void *start = *p;
int i, j, n;
int err = -EINVAL;
- u16 version;
+ u8 mdsmap_v, mdsmap_cv;
m = kzalloc(sizeof(*m), GFP_NOFS);
if (m == NULL)
return ERR_PTR(-ENOMEM);
- ceph_decode_16_safe(p, end, version, bad);
- if (version > 3) {
- pr_warn("got mdsmap version %d > 3, failing", version);
- goto bad;
+ ceph_decode_need(p, end, 1 + 1, bad);
+ mdsmap_v = ceph_decode_8(p);
+ mdsmap_cv = ceph_decode_8(p);
+ if (mdsmap_v >= 4) {
+ u32 mdsmap_len;
+ ceph_decode_32_safe(p, end, mdsmap_len, bad);
+ if (end < *p + mdsmap_len)
+ goto bad;
+ end = *p + mdsmap_len;
}
ceph_decode_need(p, end, 8*sizeof(u32) + sizeof(u64), bad);
@@ -87,16 +92,29 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
u32 namelen;
s32 mds, inc, state;
u64 state_seq;
- u8 infoversion;
+ u8 info_v;
+ void *info_end = NULL;
struct ceph_entity_addr addr;
u32 num_export_targets;
void *pexport_targets = NULL;
struct ceph_timespec laggy_since;
struct ceph_mds_info *info;
- ceph_decode_need(p, end, sizeof(u64)*2 + 1 + sizeof(u32), bad);
+ ceph_decode_need(p, end, sizeof(u64) + 1, bad);
global_id = ceph_decode_64(p);
- infoversion = ceph_decode_8(p);
+ info_v= ceph_decode_8(p);
+ if (info_v >= 4) {
+ u32 info_len;
+ u8 info_cv;
+ ceph_decode_need(p, end, 1 + sizeof(u32), bad);
+ info_cv = ceph_decode_8(p);
+ info_len = ceph_decode_32(p);
+ info_end = *p + info_len;
+ if (info_end > end)
+ goto bad;
+ }
+
+ ceph_decode_need(p, end, sizeof(u64) + sizeof(u32), bad);
*p += sizeof(u64);
namelen = ceph_decode_32(p); /* skip mds name */
*p += namelen;
@@ -115,7 +133,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
*p += sizeof(u32);
ceph_decode_32_safe(p, end, namelen, bad);
*p += namelen;
- if (infoversion >= 2) {
+ if (info_v >= 2) {
ceph_decode_32_safe(p, end, num_export_targets, bad);
pexport_targets = *p;
*p += num_export_targets * sizeof(u32);
@@ -123,6 +141,12 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
num_export_targets = 0;
}
+ if (info_end && *p != info_end) {
+ if (*p > info_end)
+ goto bad;
+ *p = info_end;
+ }
+
dout("mdsmap_decode %d/%d %lld mds%d.%d %s %s\n",
i+1, n, global_id, mds, inc,
ceph_pr_addr(&addr.in_addr),
@@ -163,6 +187,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
m->m_cas_pg_pool = ceph_decode_64(p);
/* ok, we don't care about the rest. */
+ *p = end;
dout("mdsmap_decode success epoch %u\n", m->m_epoch);
return m;