libnftables: Move scanner object into struct nft_ctx

The initial approach of keeping as much of lex/yacc-specific data
local to the relevant parsing routines was flawed in that input
descriptors which parsed commands' location information points at were
freed after parsing (in scanner_destroy()) although they were required
later for error reporting in case a command was rejected by the kernel.

To overcome this, keep the scanner pointer in struct nft_ctx so that it
can be kept in place until kernel communication has finished.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/nftables.h b/include/nftables.h
index f88d0530..5e209b41 100644
--- a/include/nftables.h
+++ b/include/nftables.h
@@ -52,6 +52,7 @@ struct nft_ctx {
 	struct nft_cache	cache;
 	uint32_t		flags;
 	struct parser_state	*state;
+	void			*scanner;
 };
 
 enum nftables_exit_codes {