afs: Fix key leak in afs_release() and afs_evict_inode()

[ 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@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/afs/file.c b/fs/afs/file.c
index 843d3b9..0bd78df 100644 (file)
--- 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 0726e40..718fab2 100644 (file)
--- 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;