afs: Fix afs_xattr_get_yfs() to not try freeing an error value
afs_xattr_get_yfs() tries to free yacl, which may hold an error value (say
if yfs_fs_fetch_opaque_acl() failed and returned an error).
Fix this by allocating yacl up front (since it's a fixed-length struct,
unlike afs_acl) and passing it in to the RPC function. This also allows
the flags to be placed in the object rather than passing them through to
the RPC function.
Fixes: ae46578b963f ("afs: Get YFS ACLs and information through xattrs")
Signed-off-by: David Howells <[email protected]>
diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index 6cf7d16..d3e9e3f 100644
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -2333,12 +2333,6 @@ void yfs_free_opaque_acl(struct yfs_acl *yacl)
}
}
-static void yfs_destroy_fs_fetch_opaque_acl(struct afs_call *call)
-{
- yfs_free_opaque_acl(call->reply[0]);
- afs_flat_call_destructor(call);
-}
-
/*
* YFS.FetchOpaqueACL operation type
*/
@@ -2346,18 +2340,17 @@ static const struct afs_call_type yfs_RXYFSFetchOpaqueACL = {
.name = "YFS.FetchOpaqueACL",
.op = yfs_FS_FetchOpaqueACL,
.deliver = yfs_deliver_fs_fetch_opaque_acl,
- .destructor = yfs_destroy_fs_fetch_opaque_acl,
+ .destructor = afs_flat_call_destructor,
};
/*
* Fetch the YFS advanced ACLs for a file.
*/
struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *fc,
- unsigned int flags)
+ struct yfs_acl *yacl)
{
struct afs_vnode *vnode = fc->vnode;
struct afs_call *call;
- struct yfs_acl *yacl;
struct afs_net *net = afs_v2net(vnode);
__be32 *bp;
@@ -2370,19 +2363,15 @@ struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *fc,
sizeof(__be32) * 2 +
sizeof(struct yfs_xdr_YFSFetchStatus) +
sizeof(struct yfs_xdr_YFSVolSync));
- if (!call)
- goto nomem;
+ if (!call) {
+ fc->ac.error = -ENOMEM;
+ return ERR_PTR(-ENOMEM);
+ }
- yacl = kzalloc(sizeof(struct yfs_acl), GFP_KERNEL);
- if (!yacl)
- goto nomem_call;
-
- yacl->flags = flags;
call->key = fc->key;
call->reply[0] = yacl;
call->reply[1] = vnode;
call->reply[2] = NULL; /* volsync */
- call->ret_reply0 = true;
/* marshall the parameters */
bp = call->request;
@@ -2396,12 +2385,6 @@ struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *fc,
trace_afs_make_fs_call(call, &vnode->fid);
afs_make_call(&fc->ac, call, GFP_KERNEL);
return (struct yfs_acl *)afs_wait_for_call_to_complete(call, &fc->ac);
-
-nomem_call:
- afs_put_call(call);
-nomem:
- fc->ac.error = -ENOMEM;
- return ERR_PTR(-ENOMEM);
}
/*
