FAILED: patch "[PATCH] selinux: add the processing of the failure of" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.19-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 <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x 6dd1e4c045afa6a4ba5d46f044c83bd357c593c2
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024081935-borax-concerned-4bcc@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

6dd1e4c045af ("selinux: add the processing of the failure of avc_add_xperms_decision()")

thanks,

greg k-h

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

From 6dd1e4c045afa6a4ba5d46f044c83bd357c593c2 Mon Sep 17 00:00:00 2001
From: Zhen Lei <thunder.leizhen@huawei.com>
Date: Wed, 7 Aug 2024 17:00:56 +0800
Subject: [PATCH] selinux: add the processing of the failure of
 avc_add_xperms_decision()

When avc_add_xperms_decision() fails, the information recorded by the new
avc node is incomplete. In this case, the new avc node should be released
instead of replacing the old avc node.

Cc: stable@vger.kernel.org
Fixes: fa1aa143ac4a ("selinux: extended permissions for ioctls")
Suggested-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 7087cd2b802d..b49c44869dc4 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -907,7 +907,11 @@ static int avc_update_node(u32 event, u32 perms, u8 driver, u8 xperm, u32 ssid,
 		node->ae.avd.auditdeny &= ~perms;
 		break;
 	case AVC_CALLBACK_ADD_XPERMS:
-		avc_add_xperms_decision(node, xpd);
+		rc = avc_add_xperms_decision(node, xpd);
+		if (rc) {
+			avc_node_kill(node);
+			goto out_unlock;
+		}
 		break;
 	}
 	avc_node_replace(node, orig);