Commit a5506049 authored Jun 06, 2012 by Xi Wang Committed by Alex Elder Jun 07, 2012

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>

parent e91a9b63

net/ceph/osdmap.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;