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authorChuck Lever <chuck.lever@oracle.com>2017-06-23 17:18:00 -0400
committerJ. Bruce Fields <bfields@redhat.com>2017-06-28 14:21:44 -0400
commitca5c76aba7502d52a6019358ec04bd4d734037d7 (patch)
tree657fe7bdd07b1dcf53352f59133c19106c46d3d8 /net/sunrpc
parent3c22f326074d2306041b0c5c9df516464349564d (diff)
svcrdma: Improve Reply chunk sanity checking
Identify malformed transport headers and unsupported chunk combinations as early as possible. - Ensure that segment lengths are not crazy. - Ensure that the Reply chunk's segment count is not crazy. With a 1KB inline threshold, the largest number of Write segments that can be conveyed is about 60 (for a RDMA_NOMSG Reply message). Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_recvfrom.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index cf8be18f297a..b48089314f85 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -217,15 +217,20 @@ static __be32 *xdr_check_write_list(__be32 *p, const __be32 *end)
return p;
}
-static __be32 *xdr_check_reply_chunk(__be32 *p, __be32 *end)
+/* Sanity check the Reply chunk.
+ *
+ * Sanity checks:
+ * - Reply chunk does not overflow buffer.
+ * - Segment size limited by largest NFS data payload.
+ *
+ * Returns pointer to the following RPC header.
+ */
+static __be32 *xdr_check_reply_chunk(__be32 *p, const __be32 *end)
{
- __be32 *next;
-
if (*p++ != xdr_zero) {
- next = p + 1 + be32_to_cpup(p) * rpcrdma_segment_maxsz;
- if (next > end)
+ p = xdr_check_write_chunk(p, end, MAX_BYTES_SPECIAL_SEG);
+ if (!p)
return NULL;
- p = next;
}
return p;
}