linux-kernel - [PATCH 4.19 375/639] afs: Fix key leak in afs_release() and afs_evict

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Date:   Fri, 24 Jan 2020 10:29:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 375/639] afs: Fix key leak in afs_release() and afs_evict_inode()

From: David Howells <dhowells@...hat.com>

[ Upstream commit a1b879eefc2b34cd3f17187ef6fc1cf3960e9518 ]

Fix afs_release() to go through the cleanup part of the function if
FMODE_WRITE is set rather than exiting through vfs_fsync() (which skips the
cleanup).  The cleanup involves discarding the refs on the key used for
file ops and the writeback key record.

Also fix afs_evict_inode() to clean up any left over wb keys attached to
the inode/vnode when it is removed.

Fixes: 5a8132761609 ("afs: Do better accretion of small writes on newly created content")
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/file.c  | 7 ++++---
 fs/afs/inode.c | 1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/afs/file.c b/fs/afs/file.c
index 843d3b970b845..0bd78df6a64e6 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -169,11 +169,12 @@ int afs_release(struct inode *inode, struct file *file)
 {
 	struct afs_vnode *vnode = AFS_FS_I(inode);
 	struct afs_file *af = file->private_data;
+	int ret = 0;
 
 	_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
 
 	if ((file->f_mode & FMODE_WRITE))
-		return vfs_fsync(file, 0);
+		ret = vfs_fsync(file, 0);
 
 	file->private_data = NULL;
 	if (af->wb)
@@ -181,8 +182,8 @@ int afs_release(struct inode *inode, struct file *file)
 	key_put(af->key);
 	kfree(af);
 	afs_prune_wb_keys(vnode);
-	_leave(" = 0");
-	return 0;
+	_leave(" = %d", ret);
+	return ret;
 }
 
 /*
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 0726e40db0f8b..718fab2f151a1 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -541,6 +541,7 @@ void afs_evict_inode(struct inode *inode)
 	}
 #endif
 
+	afs_prune_wb_keys(vnode);
 	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
 	key_put(vnode->lock_key);
 	vnode->lock_key = NULL;
-- 
2.20.1