netdev - [PATCH net] libceph: osdmap: Fix some NULL dereferences

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Date:   Thu, 13 Jul 2017 10:45:17 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Ilya Dryomov <idryomov@...il.com>
Cc:     "Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        ceph-devel@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net] libceph: osdmap: Fix some NULL dereferences

There are hidden gotos in the ceph_decode_* macros.  We need to set the
"err" variable on these error paths otherwise we end up returning
ERR_PTR(0) which is NULL.  It causes NULL dereferences in the callers.

Fixes: 278b1d709c6a ("libceph: ceph_decode_skip_* helpers")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 864789c5974e..c7521a847ef7 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -510,6 +510,7 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 		}
 	}
 
+	err = -EINVAL;
 	ceph_decode_skip_map(p, end, 32, string, bad); /* type_map */
 	ceph_decode_skip_map(p, end, 32, string, bad); /* name_map */
 	ceph_decode_skip_map(p, end, 32, string, bad); /* rule_name_map */
@@ -1825,9 +1826,9 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	if (struct_v >= 3) {
 		/* new_erasure_code_profiles */
 		ceph_decode_skip_map_of_map(p, end, string, string, string,
-					    bad);
+					    e_inval);
 		/* old_erasure_code_profiles */
-		ceph_decode_skip_set(p, end, string, bad);
+		ceph_decode_skip_set(p, end, string, e_inval);
 	}
 
 	if (struct_v >= 4) {