Fix for an assertion fail when trying to match against an all-wildcard
interface name:
| % nft add rule t c iifname '"*"'
| nft: expression.c:402: constant_expr_alloc: Assertion `(((len) + (8) - 1) / (8)) > 0' failed.
| zsh: abort nft add rule t c iifname '"*"'
Fix this by detecting the string in expr_evaluate_string() and returning
an error message:
| % nft add rule t c iifname '"*"'
| Error: All-wildcard strings are not supported
| add rule t c iifname "*"
| ^^^
While being at it, drop the 'datalen >= 1' clause from the following
conditional as together with the added check for 'datalen == 0', all
possible other values have been caught already.
Signed-off-by: Phil Sutter <phil@xxxxxx>
---
src/evaluate.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/src/evaluate.c b/src/evaluate.c
index c8045e5ded729..5f17d7501ac0e 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -324,8 +324,11 @@ static int expr_evaluate_string(struct eval_ctx *ctx, struct expr **exprp)
return 0;
}
- if (datalen >= 1 &&
- data[datalen - 1] == '\\') {
+ if (datalen == 0)
+ return expr_error(ctx->msgs, expr,
+ "All-wildcard strings are not supported");
+
+ if (data[datalen - 1] == '\\') {
char unescaped_str[data_len];
memset(unescaped_str, 0, sizeof(unescaped_str));
--
2.28.0
