From: Alexander Boyko <c17825@cray.com>
Date: Tue, 28 May 2019 10:07:12 +0000 (-0400)
Subject: LU-12140 lnet: adds checking msg len
X-Git-Tag: 2.12.54~10
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=4d43a6c3b182485ffaf7d94c726653b1a36d1b9b

LU-12140 lnet: adds checking msg len

The LNET can't handle a msg with len larger than LNET_MTU.
The next error occured for DOM 1MB
 LNetError: 3137:0:(lib-move.c:4143:lnet_parse()) 192.168.8.1@tcp,
 src 192.168.8.1@tcp: bad PUT payload 1051832 (1048576 max expected)

The patch adds fragment size check.

Signed-off-by: Alexander Boyko <c17825@cray.com>
Cray-bug-id: LUS-7174
Change-Id: Id2d21ebd87ab0bf3a9114548900fab99b278ffb0
Reviewed-on: https://review.whamcloud.com/34975
Tested-by: Jenkins
Reviewed-by: Alexey Lyashkov <c17817@cray.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---

diff --git a/lnet/lnet/lib-md.c b/lnet/lnet/lib-md.c
index 9bf890c..7737744 100644
--- a/lnet/lnet/lib-md.c
+++ b/lnet/lnet/lib-md.c
@@ -335,6 +335,10 @@ lnet_md_validate(struct lnet_md *umd)
 		CERROR("Invalid option: too many fragments %u, %d max\n",
 		       umd->length, LNET_MAX_IOV);
 		return -EINVAL;
+	} else if (umd->length > LNET_MTU) {
+		CERROR("Invalid length: too big fragment size %u, %d max\n",
+		       umd->length, LNET_MTU);
+		return -EINVAL;
 	}
 
 	return 0;