linux-kernel - [PATCH 03/06] 9p: v9fs_fid_lookup_with

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Date:   Sun, 12 Jun 2022 17:53:26 +0900
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Christian Schoenebeck <linux_oss@...debyte.com>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>
Cc:     v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH 03/06] 9p: v9fs_fid_lookup_with_uid fix's fix suggestion

Tyler, I can just squash this in your commit if you're ok with this,
as I've already rebased the other patches on top of it.

Cc: Tyler Hicks <tyhicks@...ux.microsoft.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
---
 fs/9p/fid.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index 5a469b79c1ee..baf2b152229e 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -221,12 +221,15 @@ static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry,
 		 * walk to ensure none of the patch component change
 		 */
 		fid = p9_client_walk(fid, l, &wnames[i], clone);
-		p9_client_clunk(old_fid);
+		/* non-cloning walk will return the same fid */
+		if (fid != old_fid) {
+			p9_client_clunk(old_fid);
+			old_fid = fid;
+		}
 		if (IS_ERR(fid)) {
 			kfree(wnames);
 			goto err_out;
 		}
-		old_fid = fid;
 		i += l;
 		clone = 0;
 	}
-- 
2.35.1