git: 25c2c952e3f6 - main - jail: Add proper prison locking in mqfs_prison_remove.

[Jamie Gritton]

The branch main has been updated by jamie:

URL: https://cgit.FreeBSD.org/src/commit/?id=25c2c952e3f64ec1a59033c0e2dc870a6c818a84

commit 25c2c952e3f64ec1a59033c0e2dc870a6c818a84
Author:     Jamie Gritton <jamie at FreeBSD.org>
AuthorDate: 2021-01-18 01:37:03 +0000
Commit:     Jamie Gritton <jamie at FreeBSD.org>
CommitDate: 2021-01-18 01:41:09 +0000

    jail: Add proper prison locking in mqfs_prison_remove.
---
 sys/kern/uipc_mqueue.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/kern/uipc_mqueue.c b/sys/kern/uipc_mqueue.c
index fc888023a40f..309fa3423fbd 100644
--- a/sys/kern/uipc_mqueue.c
+++ b/sys/kern/uipc_mqueue.c
@@ -1562,14 +1562,16 @@ static int
 mqfs_prison_remove(void *obj, void *data __unused)
 {
 	const struct prison *pr = obj;
-	const struct prison *tpr;
+	struct prison *tpr;
 	struct mqfs_node *pn, *tpn;
 	int found;
 
 	found = 0;
 	TAILQ_FOREACH(tpr, &allprison, pr_list) {
+		prison_lock(tpr);
 		if (tpr->pr_root == pr->pr_root && tpr != pr && tpr->pr_ref > 0)
 			found = 1;
+		prison_unlock(tpr);
 	}
 	if (!found) {
 		/*