Address fuzzer issue with undefined behavior on memory overflow.

bakpakin · bakpakin · commit 88c42fff4850 · 2026-06-27T14:00:07.000-05:00
diff --git a/src/core/util.c b/src/core/util.c
@@ -277,7 +277,7 @@ int32_t janet_tablen(int32_t n) {
     n |= n >> 4;
     n |= n >> 8;
     n |= n >> 16;
-    return n + 1;
+    return n == INT32_MAX ? INT32_MAX : n + 1;
 }
 
 /* Avoid some undefined behavior that was common in the code base. */

Original file line number	Diff line number	Diff line change
`@@ -277,7 +277,7 @@ int32_t janet_tablen(int32_t n) {`
`277`	`277`	`n \|= n >> 4;`
`278`	`278`	`n \|= n >> 8;`
`279`	`279`	`n \|= n >> 16;`
`280`		`- return n + 1;`
	`280`	`+ return n == INT32_MAX ? INT32_MAX : n + 1;`
`281`	`281`	`}`
`282`	`282`
`283`	`283`	`/* Avoid some undefined behavior that was common in the code base. */`