netfilter: nft_compat: fix module refcount underflow

commit 520aa7414bb590f39d0d1591b06018e60cbc7cf4 upstream.

Feb 12 18:20:42 nfdev kernel: ------------[ cut here ]------------
Feb 12 18:20:42 nfdev kernel: WARNING: CPU: 4 PID: 4359 at kernel/module.c:963 module_put+0x9b/0xba()
Feb 12 18:20:42 nfdev kernel: CPU: 4 PID: 4359 Comm: ebtables-compat Tainted: G        W      3.19.0-rc6+ #43
[...]
Feb 12 18:20:42 nfdev kernel: Call Trace:
Feb 12 18:20:42 nfdev kernel: [<ffffffff815fd911>] dump_stack+0x4c/0x65
Feb 12 18:20:42 nfdev kernel: [<ffffffff8103e6f7>] warn_slowpath_common+0x9c/0xb6
Feb 12 18:20:42 nfdev kernel: [<ffffffff8109919f>] ? module_put+0x9b/0xba
Feb 12 18:20:42 nfdev kernel: [<ffffffff8103e726>] warn_slowpath_null+0x15/0x17
Feb 12 18:20:42 nfdev kernel: [<ffffffff8109919f>] module_put+0x9b/0xba
Feb 12 18:20:42 nfdev kernel: [<ffffffff813ecf7c>] nft_match_destroy+0x45/0x4c
Feb 12 18:20:42 nfdev kernel: [<ffffffff813e683f>] nf_tables_rule_destroy+0x28/0x70

Reported-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Tested-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index ad979612238a4afd5f6fb75afbb20e31e25b87d1..7350723aeb15772e31c6ff1b9eec4f49a3a03503 100644 (file)
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -611,8 +611,12 @@ nft_match_select_ops(const struct nft_ctx *ctx,
                struct xt_match *match = nft_match->ops.data;
 
                if (strcmp(match->name, mt_name) == 0 &&
-                   match->revision == rev && match->family == family)
+                   match->revision == rev && match->family == family) {
+                       if (!try_module_get(match->me))
+                               return ERR_PTR(-ENOENT);
+
                        return &nft_match->ops;
+               }
        }
 
        match = xt_request_find_match(family, mt_name, rev);
@@ -682,8 +686,12 @@ nft_target_select_ops(const struct nft_ctx *ctx,
                struct xt_target *target = nft_target->ops.data;
 
                if (strcmp(target->name, tg_name) == 0 &&
-                   target->revision == rev && target->family == family)
+                   target->revision == rev && target->family == family) {
+                       if (!try_module_get(target->me))
+                               return ERR_PTR(-ENOENT);
+
                        return &nft_target->ops;
+               }
        }
 
        target = xt_request_find_target(family, tg_name, rev);