linux-kernel - [PATCH 4.14 81/94] ovl: fix format of setxattr debug

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Message-Id: <20181008175610.380117639@linuxfoundation.org>
Date:   Mon,  8 Oct 2018 20:32:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Amir Goldstein <amir73il@...il.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 4.14 81/94] ovl: fix format of setxattr debug

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszeredi@...hat.com>

commit 1a8f8d2a443ef9ad9a3065ba8c8119df714240fa upstream.

Format has a typo: it was meant to be "%.*s", not "%*s".  But at some point
callers grew nonprintable values as well, so use "%*pE" instead with a
maximized length.

Reported-by: Amir Goldstein <amir73il@...il.com>
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Fixes: 3a1e819b4e80 ("ovl: store file handle of lower inode on copy up")
Cc: <stable@...r.kernel.org> # v4.12
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/overlayfs/overlayfs.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -136,8 +136,8 @@ static inline int ovl_do_setxattr(struct
 				  const void *value, size_t size, int flags)
 {
 	int err = vfs_setxattr(dentry, name, value, size, flags);
-	pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
-		 dentry, name, (int) size, (char *) value, flags, err);
+	pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, 0x%x) = %i\n",
+		 dentry, name, min((int)size, 48), value, size, flags, err);
 	return err;
 }