FAILED: patch "[PATCH] ceph: avoid putting the realm twice when decoding snaps fails" failed to apply to 5.15-stable tree

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Possible dependencies:

51884d153f7e ("ceph: avoid putting the realm twice when decoding snaps fails") 2e586641c950 ("ceph: do not update snapshot context when there is no new snapshot")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 51884d153f7ec85e18d607b2467820a90e0f4359 Mon Sep 17 00:00:00 2001
From: Xiubo Li <[email protected]>
Date: Wed, 9 Nov 2022 11:00:39 +0800
Subject: [PATCH] ceph: avoid putting the realm twice when decoding snaps fails

When decoding the snaps fails it maybe leaving the 'first_realm' and 'realm' pointing to the same snaprealm memory. And then it'll put it twice and could cause random use-after-free, BUG_ON, etc issues.

index 864cdaa0d2bd..e4151852184e 100644
@@ -763,7 +763,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
 	struct ceph_mds_snap_realm *ri;    /* encoded */
 	__le64 *snaps;                     /* encoded */
 	__le64 *prior_parent_snaps;        /* encoded */
-	struct ceph_snap_realm *realm = NULL;
+	struct ceph_snap_realm *realm;
 	struct ceph_snap_realm *first_realm = NULL;
 	struct ceph_snap_realm *realm_to_rebuild = NULL;
 	int rebuild_snapcs;

@@ -774,6 +774,7 @@ int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
 
 	dout("%s deletion=%d\n", __func__, deletion);
 more:
+	realm = NULL;
 	rebuild_snapcs = 0;
 	ceph_decode_need(&p, e, sizeof(*ri), bad);
 	ri = p;