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Fri, 01 Sep 2023 18:03:22 +0000 From: mwilck@suse.com To: Christophe Varoqui , Benjamin Marzinski Date: Fri, 1 Sep 2023 20:02:33 +0200 Message-ID: <20230901180235.23980-21-mwilck@suse.com> In-Reply-To: <20230901180235.23980-1-mwilck@suse.com> References: <20230901180235.23980-1-mwilck@suse.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Subject: [dm-devel] [PATCH 20/21] libmultipath: dm_get_uuid(): return emtpy UUID for non-existing maps X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dm-devel@redhat.com, Martin Wilck Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: suse.com From: Martin Wilck libdevmapper will most probably not return a UUID for non-existing maps anyway. But it's cheap to double-check here. Signed-off-by: Martin Wilck Reviewed-by: Benjamin Marzinski --- libmultipath/devmapper.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/libmultipath/devmapper.c b/libmultipath/devmapper.c index 248c373..9be82f4 100644 --- a/libmultipath/devmapper.c +++ b/libmultipath/devmapper.c @@ -706,12 +706,16 @@ dm_get_prefixed_uuid(const char *name, char *uuid, int uuid_len) { struct dm_task *dmt; const char *uuidtmp; + struct dm_info info; int r = 1; dmt = libmp_dm_task_create(DM_DEVICE_INFO); if (!dmt) return 1; + if (uuid_len > 0) + uuid[0] = '\0'; + if (!dm_task_set_name (dmt, name)) goto uuidout; @@ -720,11 +724,13 @@ dm_get_prefixed_uuid(const char *name, char *uuid, int uuid_len) goto uuidout; } + if (!dm_task_get_info(dmt, &info) || + !info.exists) + goto uuidout; + uuidtmp = dm_task_get_uuid(dmt); if (uuidtmp) strlcpy(uuid, uuidtmp, uuid_len); - else - uuid[0] = '\0'; r = 0; uuidout: