From 8d0cd09d73a9a9d57ee73b7a79114e881dad1507 Mon Sep 17 00:00:00 2001
From: Jes Sorensen <jsorensen@fb.com>
Date: Thu, 13 Apr 2017 11:53:21 -0400
Subject: [RHEL7.5 PATCH 079/169] Query: Handle error returned by fstat()

We shouldn't ignore any error returned by fstat() even if open() didn't
fail.

Signed-off-by: Jes Sorensen <jsorensen@fb.com>
---
 Query.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/Query.c b/Query.c
index bea273f..0d18da4 100644
--- a/Query.c
+++ b/Query.c
@@ -32,22 +32,21 @@ int Query(char *dev)
 	 * whether it is an md device and whether it has
 	 * a superblock
 	 */
-	int fd = open(dev, O_RDONLY);
-	int ioctlerr;
+	int fd;
+	int ioctlerr, staterr;
 	int superror;
 	struct mdinfo info;
 	mdu_array_info_t array;
 	struct supertype *st = NULL;
-
 	unsigned long long larray_size;
 	struct stat stb;
 	char *mddev;
 	mdu_disk_info_t disc;
 	char *activity;
 
+	fd = open(dev, O_RDONLY);
 	if (fd < 0){
-		pr_err("cannot open %s: %s\n",
-			dev, strerror(errno));
+		pr_err("cannot open %s: %s\n", dev, strerror(errno));
 		return 1;
 	}
 
@@ -56,9 +55,12 @@ int Query(char *dev)
 	else
 		ioctlerr = 0;
 
-	fstat(fd, &stb);
+	if (fstat(fd, &stb) < 0)
+		staterr = errno;
+	else
+		staterr = 0;
 
-	if (!ioctlerr) {
+	if (!ioctlerr && !staterr) {
 		if (!get_dev_size(fd, NULL, &larray_size))
 			larray_size = 0;
 	}
@@ -68,6 +70,9 @@ int Query(char *dev)
 	else if (ioctlerr)
 		printf("%s: is an md device, but gives \"%s\" when queried\n",
 		       dev, strerror(ioctlerr));
+	else if (staterr)
+		printf("%s: is not a valid md device, returning %s\n",
+		       dev, strerror(ioctlerr));
 	else {
 		printf("%s: %s %s %d devices, %d spare%s. Use mdadm --detail for more detail.\n",
 		       dev,
-- 
2.7.4