linux-kernel - [PATCH 3.16 065/136] ceph: just skip unrecognized info in ceph_reply_info

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Message-ID: <lsq.1576543535.764911256@decadent.org.uk>
Date:   Tue, 17 Dec 2019 00:46:39 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Jeff Layton" <jlayton@...nel.org>,
        "Ilya Dryomov" <idryomov@...il.com>
Subject: [PATCH 3.16 065/136] ceph: just skip unrecognized info in
 ceph_reply_info_extra

3.16.80-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Jeff Layton <jlayton@...nel.org>

commit 1d3f87233e26362fc3d4e59f0f31a71b570f90b9 upstream.

In the future, we're going to want to extend the ceph_reply_info_extra
for create replies. Currently though, the kernel code doesn't accept an
extra blob that is larger than the expected data.

Change the code to skip over any unrecognized fields at the end of the
extra blob, rather than returning -EIO.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/ceph/mds_client.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -199,8 +199,8 @@ static int parse_reply_info_dir(void **p
 	}
 
 done:
-	if (*p != end)
-		goto bad;
+	/* Skip over any unrecognized fields */
+	*p = end;
 	return 0;
 
 bad:
@@ -221,12 +221,10 @@ static int parse_reply_info_filelock(voi
 		goto bad;
 
 	info->filelock_reply = *p;
-	*p += sizeof(*info->filelock_reply);
 
-	if (unlikely(*p != end))
-		goto bad;
+	/* Skip over any unrecognized fields */
+	*p = end;
 	return 0;
-
 bad:
 	return -EIO;
 }
@@ -239,18 +237,21 @@ static int parse_reply_info_create(void
 				  u64 features)
 {
 	if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
+		/* Malformed reply? */
 		if (*p == end) {
 			info->has_create_ino = false;
 		} else {
 			info->has_create_ino = true;
-			info->ino = ceph_decode_64(p);
+			ceph_decode_64_safe(p, end, info->ino, bad);
 		}
+	} else {
+		if (*p != end)
+			goto bad;
 	}
 
-	if (unlikely(*p != end))
-		goto bad;
+	/* Skip over any unrecognized fields */
+	*p = end;
 	return 0;
-
 bad:
 	return -EIO;
 }