From 498385e3aaf265d6e9786e0a391196cd82ab3260 Mon Sep 17 00:00:00 2001

From: Pingfan Liu <piliu@redhat.com>

Date: Fri, 18 Jun 2021 18:14:20 +0800

Subject: [PATCH 6/6] numactl.c: fix use after free

The following command can trigger the bug

  numactl --length 65536 --shm xxx -p0 -V > /dev/null

So reset mask to block any new access inside this loop.

Signed-off-by: Pingfan Liu <piliu@redhat.com>

---

 numactl.c | 1 +

 1 file changed, 1 insertion(+)

diff --git a/numactl.c b/numactl.c

index 5a9d2df..ae41d6c 100644

--- a/numactl.c

+++ b/numactl.c

@@ -544,6 +544,7 @@ int main(int ac, char **av)

 			if (nnodes != 1)

 				usage();

 			numa_bitmask_free(mask);

+			mask = NULL;

 			errno = 0;

 			did_node_cpu_parse = 1;

 			numa_set_bind_policy(0);

-- 

2.29.2