[PATCH v6 1/3] libceph: fail the sparse-read if the data length doesn't match

[xiubli@redhat.com]

From: Xiubo Li <xiubli@redhat.com>

Once this happens that means there have bugs.

URL: https://tracker.ceph.com/issues/63586
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
---
 net/ceph/osd_client.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 9be80d01c1dc..837b69541376 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -5857,8 +5857,8 @@ static int osd_sparse_read(struct ceph_connection *con,
 	struct ceph_osd *o = con->private;
 	struct ceph_sparse_read *sr = &o->o_sparse_read;
 	u32 count = sr->sr_count;
-	u64 eoff, elen;
-	int ret;
+	u64 eoff, elen, len = 0;
+	int i, ret;
 
 	switch (sr->sr_state) {
 	case CEPH_SPARSE_READ_HDR:
@@ -5909,6 +5909,13 @@ static int osd_sparse_read(struct ceph_connection *con,
 		/* Convert sr_datalen to host-endian */
 		sr->sr_datalen = le32_to_cpu((__force __le32)sr->sr_datalen);
 		sr->sr_state = CEPH_SPARSE_READ_DATA;
+		for (i = 0; i < count; i++)
+			len += sr->sr_extent[i].len;
+		if (sr->sr_datalen != len) {
+			pr_warn_ratelimited("data len %u != extent len %llu\n",
+					    sr->sr_datalen, len);
+			return -EREMOTEIO;
+		}
 		fallthrough;
 	case CEPH_SPARSE_READ_DATA:
 		if (sr->sr_index >= count) {
-- 
2.43.0