linux-kernel - [PATCH][linux-next] fs: Fix lookup_flags in vfs

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Date:   Thu, 24 Feb 2022 19:17:27 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Stefan Roesch <shr@...com>, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH][linux-next] fs: Fix lookup_flags in vfs_statx()

From: Steven Rostedt (Google) <rostedt@...dmis.org>

I needed to test Linux next and it locked up at starting init.

I bisected it down to:

30512d54fae35 ("fs: replace const char* parameter in vfs_statx and do_statx with struct filename")
1e0561928e3ab ("io-uring: Copy path name during prepare stage for statx")

The first commit did not even compile, so I consider the two of the them
the same commit.

Looking at what was changed, I see that the lookup_flags were removed from
the filename_lookup() in the vfs_statx() function, and that the
lookup_flags that were used later on in the function, were never properly
updated either.

Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
diff --git a/fs/stat.c b/fs/stat.c
index f0a9702cee67..2a2132670929 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -217,7 +217,7 @@ static int vfs_statx(int dfd, struct filename
*filename, int flags, struct kstat *stat, u32 request_mask)
 {
 	struct path path;
-	unsigned lookup_flags = 0;
+	unsigned lookup_flags = getname_statx_lookup_flags(flags);
 	int error;
 
 	if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
AT_EMPTY_PATH | @@ -225,7 +225,7 @@ static int vfs_statx(int dfd, struct
filename *filename, int flags, return -EINVAL;
 
 retry:
-	error = filename_lookup(dfd, filename, flags, &path, NULL);
+	error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
 	if (error)
 		goto out;