From: Dominique Martinet Date: Sun, 12 Jun 2022 08:14:55 +0000 (+0900) Subject: 9p: fix fid refcount leak in v9fs_vfs_get_link X-Git-Tag: v5.15.73~2847 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f0126bcaee81dabc1926012126aa74caa03a4c6e;p=platform%2Fkernel%2Flinux-rpi.git 9p: fix fid refcount leak in v9fs_vfs_get_link commit e5690f263208c5abce7451370b7786eb25b405eb upstream. we check for protocol version later than required, after a fid has been obtained. Just move the version check earlier. Link: https://lkml.kernel.org/r/20220612085330.1451496-3-asmadeus@codewreck.org Fixes: 6636b6dcc3db ("9p: add refcount to p9_fid struct") Cc: stable@vger.kernel.org Reviewed-by: Tyler Hicks Reviewed-by: Christian Schoenebeck Signed-off-by: Dominique Martinet Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 08f48b7..15d9492 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -1228,15 +1228,15 @@ static const char *v9fs_vfs_get_link(struct dentry *dentry, return ERR_PTR(-ECHILD); v9ses = v9fs_dentry2v9ses(dentry); - fid = v9fs_fid_lookup(dentry); + if (!v9fs_proto_dotu(v9ses)) + return ERR_PTR(-EBADF); + p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); + fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) return ERR_CAST(fid); - if (!v9fs_proto_dotu(v9ses)) - return ERR_PTR(-EBADF); - st = p9_client_stat(fid); p9_client_clunk(fid); if (IS_ERR(st))