[PATCH 1/4] misc: fix valgrind complaints

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Zero the memory that we pass to the kernel via ioctls so that we never
pass userspace heap/stack garbage around.  This silences valgrind
complaints about uninitialized padding areas.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 libhandle/handle.c |   10 ++++++----
 scrub/inodes.c     |    2 +-
 scrub/spacemap.c   |    3 +--
 3 files changed, 8 insertions(+), 7 deletions(-)


diff --git a/libhandle/handle.c b/libhandle/handle.c
index 5c1686b3..27abc6b2 100644
--- a/libhandle/handle.c
+++ b/libhandle/handle.c
@@ -235,8 +235,10 @@ obj_to_handle(
 {
 	char		hbuf [MAXHANSIZ];
 	int		ret;
-	uint32_t	handlen;
-	xfs_fsop_handlereq_t hreq;
+	uint32_t	handlen = 0;
+	struct xfs_fsop_handlereq hreq = { };
+
+	memset(hbuf, 0, MAXHANSIZ);
 
 	if (opcode == XFS_IOC_FD_TO_HANDLE) {
 		hreq.fd      = obj.fd;
@@ -275,7 +277,7 @@ open_by_fshandle(
 {
 	int		fsfd;
 	char		*path;
-	xfs_fsop_handlereq_t hreq;
+	struct xfs_fsop_handlereq hreq = { };
 
 	if ((fsfd = handle_to_fsfd(fshanp, &path)) < 0)
 		return -1;
@@ -382,7 +384,7 @@ attr_list_by_handle(
 {
 	int		error, fd;
 	char		*path;
-	xfs_fsop_attrlist_handlereq_t alhreq;
+	struct xfs_fsop_attrlist_handlereq alhreq = { };
 
 	if ((fd = handle_to_fsfd(hanp, &path)) < 0)
 		return -1;
diff --git a/scrub/inodes.c b/scrub/inodes.c
index bdc12df3..63865113 100644
--- a/scrub/inodes.c
+++ b/scrub/inodes.c
@@ -111,7 +111,7 @@ scan_ag_inodes(
 	xfs_agnumber_t		agno,
 	void			*arg)
 {
-	struct xfs_handle	handle;
+	struct xfs_handle	handle = { };
 	char			descr[DESCR_BUFSZ];
 	struct xfs_inumbers_req	*ireq;
 	struct xfs_bulkstat_req	*breq;
diff --git a/scrub/spacemap.c b/scrub/spacemap.c
index 9653916d..a5508d56 100644
--- a/scrub/spacemap.c
+++ b/scrub/spacemap.c
@@ -47,11 +47,10 @@ scrub_iterate_fsmap(
 	int			i;
 	int			error;
 
-	head = malloc(fsmap_sizeof(FSMAP_NR));
+	head = calloc(1, fsmap_sizeof(FSMAP_NR));
 	if (!head)
 		return errno;
 
-	memset(head, 0, sizeof(*head));
 	memcpy(head->fmh_keys, keys, sizeof(struct fsmap) * 2);
 	head->fmh_count = FSMAP_NR;