Print error "Null string is not allowed" before assert statement.
For e.g.
nft add rule filter input meta iifname '""'
Error: Null String is not allowed
add rule filter input meta iifname ""
Signed-off-by: Harsha Sharma <harshasharmaiitr@xxxxxxxxx>
---
src/evaluate.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/evaluate.c b/src/evaluate.c
index fd61e75..ad044a4 100644
--- a/src/evaluate.c
+++ b/src/evaluate.c
@@ -235,6 +235,10 @@ static int expr_evaluate_string(struct eval_ctx *ctx, struct expr **exprp)
memset(data + len, 0, data_len - len);
mpz_export_data(data, expr->value, BYTEORDER_HOST_ENDIAN, len);
+ if (strlen(data) == 0) {
+ return expr_error(ctx->msgs, expr,
+ "Null String is not allowed");
+ }
assert(strlen(data) > 0);
datalen = strlen(data) - 1;
if (data[datalen] != '*') {
--
2.11.0
--
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