[PATCH 4/5] netfilter: nf_tables: Check u32 load in u8 nft_immediate attribute

Wed, 10 Aug 2016 12:27:34 -0700 

Fix the direct assignment from u32 data input into the dlen attribute
with a size of u8.

Signed-off-by: Laura Garcia Liebana <nev...@gmail.com>
---
 net/netfilter/nft_immediate.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/nft_immediate.c b/net/netfilter/nft_immediate.c
index db3b746..6de590c 100644
--- a/net/netfilter/nft_immediate.c
+++ b/net/netfilter/nft_immediate.c
@@ -53,6 +53,9 @@ static int nft_immediate_init(const struct nft_ctx *ctx,
                            tb[NFTA_IMMEDIATE_DATA]);
        if (err < 0)
                return err;
+
+       if (desc.len > U8_MAX)
+               return -EINVAL;
        priv->dlen = desc.len;
 
        priv->dreg = nft_parse_register(tb[NFTA_IMMEDIATE_DREG]);
-- 
2.8.1

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