[PATCH 2/3] lib/sysfs.c sys-utils/lsns.c: fix error return

[yumkam@gmail.com (Yuriy M. Kaminskiy)]

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>From a2c1a0e50581b4b8ff315d052f3b5f1654c024f8 Mon Sep 17 00:00:00 2001
From: "Yuriy M. Kaminskiy" <yumkam@gmail.com>
Date: Sat, 27 Feb 2016 19:02:49 +0300
Subject: [PATCH 2/3] lib/sysfs.c sys-utils/lsns.c: fix error return

If non-negative value returned, errno could be unset (especially 0).
---
Note: likely impossible to trigger, so this only fixes "formal correctness"

 lib/sysfs.c      | 2 +-
 sys-utils/lsns.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/sysfs.c b/lib/sysfs.c
index 53aba3a..9d76148 100644
--- a/lib/sysfs.c
+++ b/lib/sysfs.c
@@ -464,7 +464,7 @@ int sysfs_write_u64(struct sysfs_cxt *cxt, const char *attr, uint64_t num)
 
 	len = snprintf(buf, sizeof(buf), "%" PRIu64, num);
 	if (len < 0 || (size_t) len + 1 > sizeof(buf))
-		rc = -errno;
+		rc = len < 0 ? -errno : -E2BIG;
 	else
 		rc = write_all(fd, buf, len);
 
diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
index 7b8f17d..3bfc6ac 100644
--- a/sys-utils/lsns.c
+++ b/sys-utils/lsns.c
@@ -255,7 +255,7 @@ static int read_process(struct lsns *ls, pid_t pid)
 	}
 	rc = fscanf(f, "%d %*s %c %d*[^\n]", &p->pid, &p->state, &p->ppid);
 	if (rc != 3) {
-		rc = -errno;
+		rc = rc < 0 ? -errno : -EINVAL;
 		goto done;
 	}
 	rc = 0;
-- 
2.1.4