linux-kernel - [PATCH 4.14 195/343] afs: Fix the afs.cell and afs.volume xattr handlers

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Message-Id: <20200124092945.633348648@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:30:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 195/343] afs: Fix the afs.cell and afs.volume xattr handlers

From: David Howells <dhowells@...hat.com>

[ Upstream commit c73aa4102f5b9f261a907c3b3df94cd2c478504d ]

Fix the ->get handlers for the afs.cell and afs.volume xattrs to pass the
source data size to memcpy() rather than target buffer size.

Overcopying the source data occasionally causes the kernel to oops.

Fixes: d3e3b7eac886 ("afs: Add metadata xattrs")
Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/afs/xattr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/afs/xattr.c b/fs/afs/xattr.c
index 2830e4f48d854..7c6b62a94e7e7 100644
--- a/fs/afs/xattr.c
+++ b/fs/afs/xattr.c
@@ -50,7 +50,7 @@ static int afs_xattr_get_cell(const struct xattr_handler *handler,
 		return namelen;
 	if (namelen > size)
 		return -ERANGE;
-	memcpy(buffer, cell->name, size);
+	memcpy(buffer, cell->name, namelen);
 	return namelen;
 }
 
@@ -104,7 +104,7 @@ static int afs_xattr_get_volume(const struct xattr_handler *handler,
 		return namelen;
 	if (namelen > size)
 		return -ERANGE;
-	memcpy(buffer, volname, size);
+	memcpy(buffer, volname, namelen);
 	return namelen;
 }
 
-- 
2.20.1