The branch stable/12 has been updated by kp:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=e1901de87bd9112d0f5e4b9bef9d5fa27db2e341

commit e1901de87bd9112d0f5e4b9bef9d5fa27db2e341
Author:     Kristof Provost <[email protected]>
AuthorDate: 2021-08-22 14:20:15 +0000
Commit:     Kristof Provost <[email protected]>
CommitDate: 2021-09-06 08:06:41 +0000

    libpfctl: fix double free
    
    Reviewed by:    donner
    MFC after:      1 week
    Sponsored by:   Modirum MDPay
    Differential Revision:  https://reviews.freebsd.org/D31695
    
    (cherry picked from commit b0ccc2e277acddd33c65b444e7841b780b3094d7)
---
 lib/libpfctl/libpfctl.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/libpfctl/libpfctl.c b/lib/libpfctl/libpfctl.c
index 7f1e72513018..7e6bc1b14a2a 100644
--- a/lib/libpfctl/libpfctl.c
+++ b/lib/libpfctl/libpfctl.c
@@ -860,7 +860,6 @@ pfctl_get_syncookies(int dev, struct pfctl_syncookies *s)
        nvl = nvlist_unpack(nv.data, nv.len, 0);
        free(nv.data);
        if (nvl == NULL) {
-               free(nv.data);
                return (EIO);
        }
 
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