linux-kernel - [PATCH] selinux: keep context struct members in sync

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Message-Id: <20230511123148.722343-1-cgzones@googlemail.com>
Date:   Thu, 11 May 2023 14:31:47 +0200
From:   Christian Göttsche <cgzones@...glemail.com>
To:     selinux@...r.kernel.org
Cc:     Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] selinux: keep context struct members in sync

Commit 53f3517ae087 ("selinux: do not leave dangling pointer behind")
reset the `str` field of the `context` struct in an OOM error branch.
In this struct the fields `str` and `len` are coupled and should be kept
in sync.  Set the length to zero according to the string be set to NULL.

Fixes: 53f3517ae087 ("selinux: do not leave dangling pointer behind")
Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
 security/selinux/ss/context.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/selinux/ss/context.h b/security/selinux/ss/context.h
index 44179977f434..aed704b8c642 100644
--- a/security/selinux/ss/context.h
+++ b/security/selinux/ss/context.h
@@ -168,6 +168,7 @@ static inline int context_cpy(struct context *dst, const struct context *src)
 	if (rc) {
 		kfree(dst->str);
 		dst->str = NULL;
+		dst->len = 0;
 		return rc;
 	}
 	return 0;
-- 
2.40.1