From: Liping Zhang <[email protected]>
If we add a chain and specify the nonexistent chain type, chain_type_name_lookup
will return a NULL pointer, and meet the assert condition in xstrdup.
Fix crash like this:
# nft add chain filter input {type none hook input priority 0\;}
nft: utils.c:63: xstrdup: Assertion `s != ((void *)0)' failed.
Aborted (core dumped)
Signed-off-by: Liping Zhang <[email protected]>
---
src/parser_bison.y | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/src/parser_bison.y b/src/parser_bison.y
index 0452b8f..ef10dee 100644
--- a/src/parser_bison.y
+++ b/src/parser_bison.y
@@ -1124,12 +1124,14 @@ type_identifier : STRING { $$ = $1; }
hook_spec : TYPE STRING HOOK
STRING dev_spec PRIORITY prio_spec
{
- $<chain>0->type =
xstrdup(chain_type_name_lookup($2));
- if ($<chain>0->type == NULL) {
+ const char *chain_type =
chain_type_name_lookup($2);
+
+ if (chain_type == NULL) {
erec_queue(error(&@2, "unknown chain
type %s", $2),
state->msgs);
YYERROR;
}
+ $<chain>0->type = xstrdup(chain_type);
xfree($2);
$<chain>0->hookstr =
chain_hookname_lookup($4);
--
2.5.5
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