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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2015-02-12 22:15:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 15:06:59 +0100 |
| commit | 17ad69a74cea38b94148cb7449d9a6c682d04444 (patch) | |
| tree | 0d6028cdaa0156c0502fd2bea14e3765681fb321 /net | |
| parent | 9104f6c68d151932d1fef0cd3cba7280671082d6 (diff) | |
| download | lwn-17ad69a74cea38b94148cb7449d9a6c682d04444.tar.gz lwn-17ad69a74cea38b94148cb7449d9a6c682d04444.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nft_compat.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c index ad979612238a..7350723aeb15 100644 --- 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); |