utils-std

commit: d969449bce707083da2f0fecb9406d59428cbd91
parent 86a271f82710fa18baac3c7050c9542c4c015ffe
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Wed, 25 Jun 2025 02:12:53 +0200

cmd/expr.y: make sure malloc(0) doesn't happens

Diffstat:
M
cmd/expr.y
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/cmd/expr.y b/cmd/expr.y
@@ -206,10 +206,12 @@ to_string(struct val *vp)
 		return;
 
 	int ndigits = snprintf(NULL, 0, "%jd", vp->u.i);
-	if(ndigits < 0)
+	if(ndigits <= 0)
 		utils_errx(ERR_EXIT, "failed to pre-format integer %jd as a string", vp->u.i);
 
 	ndigits++; // NULL terminator
+	if(ndigits <= 0)
+		utils_errx(ERR_EXIT, "pre-format length overflow", ndigits);
 
 	char *tmp = malloc(ndigits);
 	if (tmp == NULL)