linux-kernel - [PATCH 4.4 16/48] jffs2: return -ERANGE when xattr buffer is too small

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Message-Id: <20181018175428.883959029@linuxfoundation.org>
Date:   Thu, 18 Oct 2018 19:54:51 +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, Hou Tao <houtao1@...wei.com>,
        David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH 4.4 16/48] jffs2: return -ERANGE when xattr buffer is too small

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

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

From: Hou Tao <houtao1@...wei.com>

When a file have multiple xattrs and the passed buffer is
smaller than the required size, jffs2_listxattr() should
return -ERANGE instead of continue, else Oops may occur
due to memory corruption.

Also remove the unnecessary check ("rc < 0"), because
xhandle->list(...) will not return an error number.

Spotted by generic/377 in xfstests-dev.

NB: The problem had been fixed by commit 764a5c6b1fa4 ("xattr
handlers: Simplify list operation") in v4.5-rc1, but the
modification in that commit may be too much because it modifies
all file-systems which implement xattr, so I create a single
patch for jffs2 to fix the problem.

Signed-off-by: Hou Tao <houtao1@...wei.com>
Cc: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/jffs2/xattr.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/fs/jffs2/xattr.c
+++ b/fs/jffs2/xattr.c
@@ -1004,12 +1004,14 @@ ssize_t jffs2_listxattr(struct dentry *d
 			rc = xhandle->list(xhandle, dentry, buffer + len,
 					   size - len, xd->xname,
 					   xd->name_len);
+			if (rc > size - len) {
+				rc = -ERANGE;
+				goto out;
+			}
 		} else {
 			rc = xhandle->list(xhandle, dentry, NULL, 0,
 					   xd->xname, xd->name_len);
 		}
-		if (rc < 0)
-			goto out;
 		len += rc;
 	}
 	rc = len;