From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Fri, 27 Jun 2014 16:51:39 +0000 (+0200)
Subject: netfilter: nf_tables: skip transaction if no update flags in tables
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=63283dd21ed2bf25a71909a820ed3e8fe412e15d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

netfilter: nf_tables: skip transaction if no update flags in tables

Skip transaction handling for table updates with no changes in
the flags. This fixes a crash when passing the table flag with all
bits unset.

Reported-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index ab4566cfcbe4..da5dc37a7402 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -407,6 +407,9 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
 	if (flags & ~NFT_TABLE_F_DORMANT)
 		return -EINVAL;
 
+	if (flags == ctx->table->flags)
+		return 0;
+
 	trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
 				sizeof(struct nft_trans_table));
 	if (trans == NULL)