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| author | Liping Zhang <liping.zhang@spreadtrum.com> | 2016-07-23 16:00:31 +0800 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-07-23 12:22:07 +0200 |
| commit | 2bf4fade54de995f84d319ae02003609dca450f3 (patch) | |
| tree | 024cb3652c7f57ae1dc8ef1df2333a2d4a2c581d | |
| parent | 96d1327ac2e3dc3ac4204fe3656dad0043fc0efd (diff) | |
| download | linux-2bf4fade54de995f84d319ae02003609dca450f3.tar.bz2 | |
netfilter: nft_compat: put back match/target module if init fail
If the user specify the invalid NFTA_MATCH_INFO/NFTA_TARGET_INFO attr
or memory alloc fail, we should call module_put to the related match
or target. Otherwise, we cannot remove the module even nobody use it.
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/nft_compat.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c index 6228c422c766..2e07cec50ffd 100644 --- a/net/netfilter/nft_compat.c +++ b/net/netfilter/nft_compat.c @@ -634,6 +634,7 @@ nft_match_select_ops(const struct nft_ctx *ctx, struct xt_match *match; char *mt_name; u32 rev, family; + int err; if (tb[NFTA_MATCH_NAME] == NULL || tb[NFTA_MATCH_REV] == NULL || @@ -660,13 +661,17 @@ nft_match_select_ops(const struct nft_ctx *ctx, if (IS_ERR(match)) return ERR_PTR(-ENOENT); - if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) - return ERR_PTR(-EINVAL); + if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) { + err = -EINVAL; + goto err; + } /* This is the first time we use this match, allocate operations */ nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); - if (nft_match == NULL) - return ERR_PTR(-ENOMEM); + if (nft_match == NULL) { + err = -ENOMEM; + goto err; + } nft_match->ops.type = &nft_match_type; nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize)); @@ -680,6 +685,9 @@ nft_match_select_ops(const struct nft_ctx *ctx, list_add(&nft_match->head, &nft_match_list); return &nft_match->ops; +err: + module_put(match->me); + return ERR_PTR(err); } static void nft_match_release(void) @@ -717,6 +725,7 @@ nft_target_select_ops(const struct nft_ctx *ctx, struct xt_target *target; char *tg_name; u32 rev, family; + int err; if (tb[NFTA_TARGET_NAME] == NULL || tb[NFTA_TARGET_REV] == NULL || @@ -743,13 +752,17 @@ nft_target_select_ops(const struct nft_ctx *ctx, if (IS_ERR(target)) return ERR_PTR(-ENOENT); - if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) - return ERR_PTR(-EINVAL); + if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) { + err = -EINVAL; + goto err; + } /* This is the first time we use this target, allocate operations */ nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL); - if (nft_target == NULL) - return ERR_PTR(-ENOMEM); + if (nft_target == NULL) { + err = -ENOMEM; + goto err; + } nft_target->ops.type = &nft_target_type; nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize)); @@ -767,6 +780,9 @@ nft_target_select_ops(const struct nft_ctx *ctx, list_add(&nft_target->head, &nft_target_list); return &nft_target->ops; +err: + module_put(target->me); + return ERR_PTR(err); } static void nft_target_release(void) |