linux-kernel - [PATCH] fs/xattr.c: fix simple_xattr

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Message-ID: <20250605164852.2016-1-stephen.smalley.work@gmail.com>
Date: Thu,  5 Jun 2025 12:48:52 -0400
From: Stephen Smalley <stephen.smalley.work@...il.com>
To: brauner@...nel.org
Cc: paul@...l-moore.com,
	linux-fsdevel@...r.kerne.org,
	linux-kernel@...r.kernel.org,
	selinux@...r.kernel.org,
	collin.funk1@...il.com,
	eggert@...ucla.edu,
	bug-gnulib@....org,
	Stephen Smalley <stephen.smalley.work@...il.com>
Subject: [PATCH] fs/xattr.c: fix simple_xattr_list()

commit 8b0ba61df5a1 ("fs/xattr.c: fix simple_xattr_list to always
include security.* xattrs") failed to reset err after the call to
security_inode_listsecurity(), which returns the length of the
returned xattr name. This results in simple_xattr_list() incorrectly
returning this length even if a POSIX acl is also set on the inode.

Reported-by: Collin Funk <collin.funk1@...il.com>
Closes: https://lore.kernel.org/selinux/8734ceal7q.fsf@gmail.com/
Reported-by: Paul Eggert <eggert@...ucla.edu>
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2369561
Fixes: 8b0ba61df5a1 ("fs/xattr.c: fix simple_xattr_list to always include security.* xattrs")

Signed-off-by: Stephen Smalley <stephen.smalley.work@...il.com>
---
 fs/xattr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/xattr.c b/fs/xattr.c
index 8ec5b0204bfd..600ae97969cf 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -1479,6 +1479,7 @@ ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs,
 		buffer += err;
 	}
 	remaining_size -= err;
+	err = 0;
 
 	read_lock(&xattrs->lock);
 	for (rbp = rb_first(&xattrs->rb_root); rbp; rbp = rb_next(rbp)) {
-- 
2.49.0