linux-kernel - [PATCH v3 02/10] fscache: Fix fscache_cookie

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Date:   Thu, 07 Oct 2021 21:43:22 +0100
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>
Cc:     dhowells@...hat.com, Jeff Layton <jlayton@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 02/10] fscache: Fix fscache_cookie_enabled() to handle NULL
 cookie

Fix fscache_cookie_enabled() to handle being given a NULL cookie pointer
(ie. a cookie was not allocated and caching should be ignored).

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/fscache.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/fscache.h b/include/linux/fscache.h
index 32f65c16328a..5e3ddb11715a 100644
--- a/include/linux/fscache.h
+++ b/include/linux/fscache.h
@@ -167,7 +167,8 @@ struct fscache_cookie {
 
 static inline bool fscache_cookie_enabled(struct fscache_cookie *cookie)
 {
-	return test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags);
+	return (fscache_cookie_valid(cookie) &&
+		test_bit(FSCACHE_COOKIE_ENABLED, &cookie->flags));
 }
 
 /*