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| author | Xi Wang <xi.wang@gmail.com> | 2012-06-06 19:35:55 -0500 |
|---|---|---|
| committer | Alex Elder <elder@dreamhost.com> | 2012-06-07 08:28:16 -0500 |
| commit | a5506049500b30dbc5edb4d07a3577477c1f3643 (patch) | |
| tree | e0229258f8f389c790f29af687cf5c13911c9bf3 /net/ceph/osdmap.c | |
| parent | e91a9b639a691e0982088b5954eaafb5a25c8f1c (diff) | |
| download | linux-stable-a5506049500b30dbc5edb4d07a3577477c1f3643.tar.gz linux-stable-a5506049500b30dbc5edb4d07a3577477c1f3643.tar.bz2 linux-stable-a5506049500b30dbc5edb4d07a3577477c1f3643.zip | |
libceph: fix overflow in osdmap_apply_incremental()
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@gmail.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Diffstat (limited to 'net/ceph/osdmap.c')
| -rw-r--r-- | net/ceph/osdmap.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c index d70aaca4a45d..d3de09f519b2 100644 --- a/net/ceph/osdmap.c +++ b/net/ceph/osdmap.c @@ -893,6 +893,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end, (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; |