From 1806ee01060d363beac01fda28c613ab27dbc4df Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Wed, 10 Jan 2018 10:18:43 +0100
Subject: [PATCH] repquota: Fix output when user -2 exists
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Vladimit Meshkov reported that when user -2 exists and user namespaces
are enabled in the kernel, repquota(8) fails to output anything. He also
analyzed this is because in such case repquota(8) tries to query info
for user -1 which is invalid ID, gets error from the kernel, and bails
out.

Fix the problem by stopping iteration over IDs when we reach ID -1.

Reported-by: Vladimir Meshkov <ubob74@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 quotaio_generic.c | 5 +++++
 quotaio_xfs.c     | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/quotaio_generic.c b/quotaio_generic.c
index 025d712..5b23955 100644
--- a/quotaio_generic.c
+++ b/quotaio_generic.c
@@ -204,6 +204,11 @@ int vfs_scan_dquots(struct quota_handle *h,
 		if (ret < 0)
 			break;
 		id = kdqblk.dqb_id + 1;
+		/* id -1 is invalid and the last one... */
+		if (id == -1) {
+			errno = ENOENT;
+			break;
+		}
 	}
 	free(dquot);
 
diff --git a/quotaio_xfs.c b/quotaio_xfs.c
index 1374cf4..56daf89 100644
--- a/quotaio_xfs.c
+++ b/quotaio_xfs.c
@@ -219,6 +219,11 @@ static int xfs_kernel_scan_dquots(struct quota_handle *h,
 		if (ret < 0)
 			break;
 		id = xdqblk.d_id + 1;
+		/* id -1 is invalid and the last one... */
+		if (id == -1) {
+			errno = ENOENT;
+			break;
+		}
 	}
 	free(dquot);
 
-- 
2.13.6