54 lines
1.4 KiB
Diff
54 lines
1.4 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Martin Wilck <mwilck@suse.com>
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Date: Fri, 25 Aug 2023 20:35:19 +0200
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Subject: [PATCH] libmultipath: dm_get_uuid(): return emtpy UUID for
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non-existing maps
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libdevmapper will most probably not return a UUID for non-existing
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maps anyway. But it's cheap to double-check here.
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Signed-off-by: Martin Wilck <mwilck@suse.com>
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Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/devmapper.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c
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index 248c3734..9be82f4e 100644
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--- a/libmultipath/devmapper.c
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+++ b/libmultipath/devmapper.c
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@@ -706,12 +706,16 @@ dm_get_prefixed_uuid(const char *name, char *uuid, int uuid_len)
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{
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struct dm_task *dmt;
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const char *uuidtmp;
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+ struct dm_info info;
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int r = 1;
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dmt = libmp_dm_task_create(DM_DEVICE_INFO);
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if (!dmt)
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return 1;
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+ if (uuid_len > 0)
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+ uuid[0] = '\0';
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+
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if (!dm_task_set_name (dmt, name))
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goto uuidout;
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@@ -720,11 +724,13 @@ dm_get_prefixed_uuid(const char *name, char *uuid, int uuid_len)
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goto uuidout;
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}
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+ if (!dm_task_get_info(dmt, &info) ||
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+ !info.exists)
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+ goto uuidout;
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+
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uuidtmp = dm_task_get_uuid(dmt);
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if (uuidtmp)
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strlcpy(uuid, uuidtmp, uuid_len);
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- else
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- uuid[0] = '\0';
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r = 0;
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uuidout:
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