From: Miklos Szeredi <mszeredi@redhat.com>
Date: Wed, 7 Jun 2023 15:49:20 +0000 (+0200)
Subject: fuse: revalidate: don't invalidate if interrupted
X-Git-Tag: v4.14.322~81
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f2b320834a2efa56c46a4c07543b93644a92d0e;p=thirdparty%2Fkernel%2Fstable.git

fuse: revalidate: don't invalidate if interrupted

commit a9d1c4c6df0e568207907c04aed9e7beb1294c42 upstream.

If the LOOKUP request triggered from fuse_dentry_revalidate() is
interrupted, then the dentry will be invalidated, possibly resulting in
submounts being unmounted.

Reported-by: Xu Rongbo <xurongbo@baidu.com>
Closes: https://lore.kernel.org/all/CAJfpegswN_CJJ6C3RZiaK6rpFmNyWmXfaEpnQUJ42KCwNF5tWw@mail.gmail.com/
Fixes: 9e6268db496a ("[PATCH] FUSE - read-write operations")
Cc: <stable@vger.kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 94ecc67292c71..8e5125904762e 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -232,7 +232,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 			spin_unlock(&fc->lock);
 		}
 		kfree(forget);
-		if (ret == -ENOMEM)
+		if (ret == -ENOMEM || ret == -EINTR)
 			goto out;
 		if (ret || fuse_invalid_attr(&outarg.attr) ||
 		    (outarg.attr.mode ^ inode->i_mode) & S_IFMT)