The branch main has been updated by jamie: URL: https://cgit.FreeBSD.org/src/commit/?id=b52dc2067618fc73e8d4d20e4035d1a67a8b455d
commit b52dc2067618fc73e8d4d20e4035d1a67a8b455d Author: Jamie Gritton <[email protected]> AuthorDate: 2026-06-09 22:31:40 +0000 Commit: Jamie Gritton <[email protected]> CommitDate: 2026-06-09 22:31:40 +0000 jail: Don't double-free the current prison in kern_jail_set/get Reported by: Yuxiang Yang, et al <yangyx22 at mails.tsinghua.edu.cn> Discussed with: markj MFC after: 3 days --- sys/kern/kern_jail.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/sys/kern/kern_jail.c b/sys/kern/kern_jail.c index bc80adb91cd6..a8d44012db0f 100644 --- a/sys/kern/kern_jail.c +++ b/sys/kern/kern_jail.c @@ -1117,14 +1117,17 @@ kern_jail_set(struct thread *td, struct uio *optuio, int flags) * Look up and create jails based on the * descriptor's prison. */ - prison_free(mypr); - error = jaildesc_find(td, jfd_in, &mypr, NULL); + struct prison *jdpr; + + error = jaildesc_find(td, jfd_in, &jdpr, NULL); if (error != 0) { vfs_opterror(opts, error == ENOENT ? "descriptor to dead jail" : "not a jail descriptor"); goto done_errmsg; } + prison_free(mypr); + mypr = jdpr; if ((flags & JAIL_CREATE) && mypr->pr_childmax == 0) { error = EPERM; goto done_free; @@ -2618,14 +2621,17 @@ kern_jail_get(struct thread *td, struct uio *optuio, int flags) } if (flags & JAIL_AT_DESC) { /* Look up jails based on the descriptor's prison. */ - prison_free(mypr); - error = jaildesc_find(td, jfd_in, &mypr, NULL); + struct prison *jdpr; + + error = jaildesc_find(td, jfd_in, &jdpr, NULL); if (error != 0) { vfs_opterror(opts, error == ENOENT ? "descriptor to dead jail" : "not a jail descriptor"); goto done; } + prison_free(mypr); + mypr = jdpr; } if (flags & (JAIL_GET_DESC | JAIL_OWN_DESC)) { /* Allocate a jail descriptor to return later. */
