linux-kernel - [PATCH 5.10 06/29] Revert "ucounts: Increase ucounts reference counter before the security hook"

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Date:   Mon,  6 Sep 2021 14:55:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Alexey Gladkov <legion@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 06/29] Revert "ucounts: Increase ucounts reference counter before the security hook"

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This reverts commit b493af3a66e067f93e5e03465507866ddeabff9e which is
commit bbb6d0f3e1feb43d663af089c7dedb23be6a04fb upstream.

The "original" commit 905ae01c4ae2 ("Add a reference to ucounts for each
cred"), should not have been applied to the 5.10.y tree, so revert it,
and the follow-on fixup patches as well.

Reported-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Link: https://lore.kernel.org/r/87v93k4bl6.fsf@disp2133
Cc: Alexey Gladkov <legion@...nel.org>
Cc: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/cred.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/kernel/cred.c
+++ b/kernel/cred.c
@@ -286,11 +286,11 @@ struct cred *prepare_creds(void)
 	new->security = NULL;
 #endif
 
-	new->ucounts = get_ucounts(new->ucounts);
-	if (!new->ucounts)
+	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)
 		goto error;
 
-	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)
+	new->ucounts = get_ucounts(new->ucounts);
+	if (!new->ucounts)
 		goto error;
 
 	validate_creds(new);
@@ -753,11 +753,11 @@ struct cred *prepare_kernel_cred(struct
 #ifdef CONFIG_SECURITY
 	new->security = NULL;
 #endif
-	new->ucounts = get_ucounts(new->ucounts);
-	if (!new->ucounts)
+	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)
 		goto error;
 
-	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)
+	new->ucounts = get_ucounts(new->ucounts);
+	if (!new->ucounts)
 		goto error;
 
 	put_cred(old);