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

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[ 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>
This commit is contained in:
David Howells 2019-05-15 12:09:17 +01:00 committed by Greg Kroah-Hartman
parent a0a4643f18
commit f1e807d392
2 changed files with 5 additions and 3 deletions
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7
fs/afs/file.c
View File

@ -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;
}
/*

1
fs/afs/inode.c
View File

@ -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;