From: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
Date: Mon, 6 Apr 2026 21:07:33 +0000 (-0400)
Subject: lib: (cpuset.c) dont calculate allocation size for 0 ncpus
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=77df1a69f31bb845546acb229c11f8aaf71d36d8;p=thirdparty%2Futil-linux.git

lib: (cpuset.c) dont calculate allocation size for 0 ncpus

If ncpus is not checked against the value 0, subsequent macros
CPU_ALLOC_SIZE and cpuset_nbits() will return garbage (0), which
can cause issues when memory has to be allocated or initialized
in callers where the size is assumed to be > 0. So let us return
NULL for 0 ncpus.

Signed-off-by: Christian Goeschel Ndjomouo <cgoesc2@wgu.edu>
---

diff --git a/lib/cpuset.c b/lib/cpuset.c
index d64692030..b04c71a35 100644
--- a/lib/cpuset.c
+++ b/lib/cpuset.c
@@ -98,8 +98,10 @@ int get_max_number_of_cpus(void)
  */
 cpu_set_t *cpuset_alloc(int ncpus, size_t *setsize, size_t *nbits)
 {
-	cpu_set_t *set = CPU_ALLOC(ncpus);
+	cpu_set_t *set = NULL;
 
+	if (ncpus)
+		set = CPU_ALLOC(ncpus);
 	if (!set)
 		return NULL;
 	if (setsize)