[3.0-stable PATCH 35/36] xfs: zero allocation_args on the kernel stack

[Mark Tinguely <tinguely@xxxxxxx>]

From: Mark Tinguely <tinguely@xxxxxxx>

Upstream commit: a00416844b8f4b0106344bdfd90fe45a854b1d05

    xfs: zero allocation_args on the kernel stack
    
    Zero the kernel stack space that makes up the xfs_alloc_arg structures.
    
    Signed-off-by: Mark Tinguely <tinguely@xxxxxxx>
    Reviewed-by: Ben Myers <bpm@xxxxxxx>
    Signed-off-by: Ben Myers <bpm@xxxxxxx>

---
 fs/xfs/xfs_alloc.c  |    1 +
 fs/xfs/xfs_bmap.c   |    3 +++
 fs/xfs/xfs_ialloc.c |    1 +
 3 files changed, 5 insertions(+)

Index: b/fs/xfs/xfs_alloc.c
===================================================================
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -1872,6 +1872,7 @@ xfs_alloc_fix_freelist(
        /*
         * Initialize the args structure.
         */
+       memset(&targs, 0, sizeof(targs));
        targs.tp = tp;
        targs.mp = mp;
        targs.agbp = agbp;
Index: b/fs/xfs/xfs_bmap.c
===================================================================
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -2561,6 +2561,7 @@ xfs_bmap_btalloc(
         * Normal allocation, done through xfs_alloc_vextent.
         */
        tryagain = isaligned = 0;
+       memset(&args, 0, sizeof(args));
        args.tp = ap->tp;
        args.mp = mp;
        args.fsbno = ap->rval;
@@ -3194,6 +3195,7 @@ xfs_bmap_extents_to_btree(
         * Convert to a btree with two levels, one record in root.
         */
        XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
+       memset(&args, 0, sizeof(args));
        args.tp = tp;
        args.mp = mp;
        args.firstblock = *firstblock;
@@ -3355,6 +3357,7 @@ xfs_bmap_local_to_extents(
                xfs_buf_t       *bp;    /* buffer for extent block */
                xfs_bmbt_rec_host_t *ep;/* extent record pointer */
 
+               memset(&args, 0, sizeof(args));
                args.tp = tp;
                args.mp = ip->i_mount;
                args.firstblock = *firstblock;
Index: b/fs/xfs/xfs_ialloc.c
===================================================================
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -251,6 +251,7 @@ xfs_ialloc_ag_alloc(
                                        /* boundary */
        struct xfs_perag *pag;
 
+       memset(&args, 0, sizeof(args));
        args.tp = tp;
        args.mp = tp->t_mountp;