Re: [PATCH] libmultipathd Avoid parsing errors due to unsupported designators

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On Mon, 2023-03-20 at 12:22 -0700, Brian Bunker wrote:
> Unsupported designators, even if they are correct, will result
> in parsing errors. Add support for these two:
> 
> Logical Unit Group (0x6)
> Vendor Specific (0x0)
> 
> Mar 20 13:37:35 init107-18 multipath[45016]: parse_vpd_pg83:
> invalid device designator at offset 87: 01060004
> Mar 20 13:37:35 init107-18 multipath[45016]: parse_vpd_pg83:
> invalid device designator at offset 131: 02000005
> 
> Thanks,
> Brian

Thanks. I've modified your patch as attached.

Martin

From 9edbc2b6154786a9e7bb38890d023301c65c8a6a Mon Sep 17 00:00:00 2001
From: Brian Bunker <brian@xxxxxxxxxxxxxxx>
Date: Mon, 20 Mar 2023 12:22:02 -0700
Subject: [PATCH] libmultipathd Avoid parsing errors due to unsupported
 designators

Unsupported designators, even if they are correct, will result
in parsing errors. Add support for these two:

Logical Unit Group (0x6)
Vendor Specific (0x0)

Mar 20 13:37:35 init107-18 multipath[45016]: parse_vpd_pg83:
invalid device designator at offset 87: 01060004
Mar 20 13:37:35 init107-18 multipath[45016]: parse_vpd_pg83:
invalid device designator at offset 131: 02000005

Thanks,
Brian

mwilck: added descriptor type 7 (MD5) for completeness.

Signed-off-by: Brian Bunker <brian@xxxxxxxxxxxxxxx>
Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
---
 libmultipath/discovery.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 3a5ba17..6865cd9 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -1211,6 +1211,17 @@ parse_vpd_pg83(const unsigned char *in, size_t in_len,
 			invalid = (d[3] < 8);
 			new_prio = 2;
 			break;
+		case 0x6:
+			/* Logical Unit Group */
+			invalid = (d[3] != 4);
+			break;
+		case 0x7:
+			/* MD5 logical unit designator */
+			invalid = (d[3] != 16);
+			break;
+		case 0x0:
+			/* Vendor Specific */
+			break;
 		case 0xa:
 			condlog(2, "%s: UUID identifiers not yet supported",
 				__func__);
-- 
2.39.2

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