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Date: Sat, 18 Apr 2020 10:39:33 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Amir Goldstein <amir73il@...il.com>, Miklos Szeredi <mszeredi@...hat.com>, Sasha Levin <sashal@...nel.org>, linux-unionfs@...r.kernel.org Subject: [PATCH AUTOSEL 5.4 04/78] ovl: fix value of i_ino for lower hardlink corner case From: Amir Goldstein <amir73il@...il.com> [ Upstream commit 300b124fcf6ad2cd99a7b721e0f096785e0a3134 ] Commit 6dde1e42f497 ("ovl: make i_ino consistent with st_ino in more cases"), relaxed the condition nfs_export=on in order to set the value of i_ino to xino map of real ino. Specifically, it also relaxed the pre-condition that index=on for consistent i_ino. This opened the corner case of lower hardlink in ovl_get_inode(), which calls ovl_fill_inode() with ino=0 and then ovl_init_inode() is called to set i_ino to lower real ino without the xino mapping. Pass the correct values of ino;fsid in this case to ovl_fill_inode(), so it can initialize i_ino correctly. Fixes: 6dde1e42f497 ("ovl: make i_ino consistent with st_ino in more ...") Signed-off-by: Amir Goldstein <amir73il@...il.com> Signed-off-by: Miklos Szeredi <mszeredi@...hat.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- fs/overlayfs/inode.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index b045cf1826fc4..bb980721502dd 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -881,7 +881,7 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL; bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry, oip->index); - int fsid = bylower ? oip->lowerpath->layer->fsid : 0; + int fsid = bylower ? lowerpath->layer->fsid : 0; bool is_dir, metacopy = false; unsigned long ino = 0; int err = oip->newinode ? -EEXIST : -ENOMEM; @@ -931,6 +931,8 @@ struct inode *ovl_get_inode(struct super_block *sb, err = -ENOMEM; goto out_err; } + ino = realinode->i_ino; + fsid = lowerpath->layer->fsid; } ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino, fsid); ovl_inode_init(inode, upperdentry, lowerdentry, oip->lowerdata); -- 2.20.1
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