netfilter: nf_tables: introduce nft_validate_register_load()
Change nft_validate_input_register() to not only validate the input
register number, but also the length of the load, and rename it to
nft_validate_register_load() to reflect that change.
Signed-off-by: Patrick McHardy <kaber@trash.net>
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 f01e89fe..d47f12b 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4122,22 +4122,27 @@
}
/**
- * nft_validate_input_register - validate an expressions' input register
+ * nft_validate_register_load - validate a load from a register
*
* @reg: the register number
+ * @len: the length of the data
*
* Validate that the input register is one of the general purpose
- * registers.
+ * registers and that the length of the load is within the bounds.
*/
-int nft_validate_input_register(enum nft_registers reg)
+int nft_validate_register_load(enum nft_registers reg, unsigned int len)
{
if (reg <= NFT_REG_VERDICT)
return -EINVAL;
if (reg > NFT_REG_MAX)
return -ERANGE;
+ if (len == 0)
+ return -EINVAL;
+ if (len > FIELD_SIZEOF(struct nft_data, data))
+ return -ERANGE;
return 0;
}
-EXPORT_SYMBOL_GPL(nft_validate_input_register);
+EXPORT_SYMBOL_GPL(nft_validate_register_load);
/**
* nft_validate_register_store - validate an expressions' register store