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netfilter: nft_range: add the missing NULL pointer check 

Otherwise, kernel panic will happen if the user does not specify
the related attributes.

Fixes: 0f3cd9b369 ("netfilter: nf_tables: add range expression")
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2016-11-21 21:18:23 +08:00 committed by Pablo Neira Ayuso
parent d3e2a1110c
commit 49cdc4c749
1 changed files with 6 additions and 0 deletions
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6
net/netfilter/nft_range.c
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@ -59,6 +59,12 @@ static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr
int err;
u32 op;
if (!tb[NFTA_RANGE_SREG] ||
!tb[NFTA_RANGE_OP] ||
!tb[NFTA_RANGE_FROM_DATA] ||
!tb[NFTA_RANGE_TO_DATA])
return -EINVAL;
err = nft_data_init(NULL, &priv->data_from, sizeof(priv->data_from),
&desc_from, tb[NFTA_RANGE_FROM_DATA]);
if (err < 0)