From d92cee7b374db9944b63bdd6c1784a2dd90ee9ca Mon Sep 17 00:00:00 2001
From: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Date: Mon, 18 May 2020 23:53:36 +0200
Subject: [PATCH 081/108] =?UTF-8?q?restripe:=20fix=20ignoring=20return=20v?=
 =?UTF-8?q?alue=20of=20=E2=80=98read=E2=80=99=20and=20lseek?=
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Got below error when run "make everything".

restripe.c: In function ‘test_stripes’:
restripe.c:870:4: error: ignoring return value of ‘read’, declared with attribute warn_unused_result [-Werror=unused-result]
    read(source[i], stripes[i], chunk_size);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix it by check the return value of ‘read’, and free memory
in the failure case.

And check the return value of lseek as well per Jes's comment.

Signed-off-by: Guoqing Jiang <guoqing.jiang@cloud.ionos.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
 restripe.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/restripe.c b/restripe.c
index 31b07e8..86e1d00 100644
--- a/restripe.c
+++ b/restripe.c
@@ -866,8 +866,16 @@ int test_stripes(int *source, unsigned long long *offsets,
 		int disk;
 
 		for (i = 0 ; i < raid_disks ; i++) {
-			lseek64(source[i], offsets[i]+start, 0);
-			read(source[i], stripes[i], chunk_size);
+			if ((lseek64(source[i], offsets[i]+start, 0) < 0) ||
+			    (read(source[i], stripes[i], chunk_size) !=
+			     chunk_size)) {
+				free(q);
+				free(p);
+				free(blocks);
+				free(stripes);
+				free(stripe_buf);
+				return -1;
+			}
 		}
 		for (i = 0 ; i < data_disks ; i++) {
 			int disk = geo_map(i, start/chunk_size, raid_disks,
-- 
2.7.5