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authorDarrick J. Wong <darrick.wong@oracle.com>2017-07-17 14:30:51 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2017-07-20 14:42:33 -0700
commit4c1a67bd3606540b9b42caff34a1d5cd94b1cf65 (patch)
treeeedada57f2b1bdaf17f7604208f44ef4ce979926 /fs
parent1e86eabe73b73c82e1110c746ed3ec6d5e1c0a0d (diff)
downloadlinux-stericsson-4c1a67bd3606540b9b42caff34a1d5cd94b1cf65.tar.gz
xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write
We must initialize the firstfsb parameter to _bmapi_write so that it doesn't incorrectly treat stack garbage as a restriction on which AGs it can search for free space. Fixes-coverity-id: 1402025 Fixes-coverity-id: 1415167 Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/libxfs/xfs_bmap.c9
-rw-r--r--fs/xfs/xfs_reflink.c2
2 files changed, 10 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 0a9880777c9c..ee118ceb702f 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -6499,6 +6499,15 @@ xfs_bmap_finish_one(
xfs_fsblock_t firstfsb;
int error = 0;
+ /*
+ * firstfsb is tied to the transaction lifetime and is used to
+ * ensure correct AG locking order and schedule work item
+ * continuations. XFS_BUI_MAX_FAST_EXTENTS (== 1) restricts us
+ * to only making one bmap call per transaction, so it should
+ * be safe to have it as a local variable here.
+ */
+ firstfsb = NULLFSBLOCK;
+
trace_xfs_bmap_deferred(tp->t_mountp,
XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type,
XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index ab2270a87196..d9b3d57a1921 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -329,7 +329,7 @@ xfs_reflink_convert_cow_extent(
xfs_filblks_t count_fsb,
struct xfs_defer_ops *dfops)
{
- xfs_fsblock_t first_block;
+ xfs_fsblock_t first_block = NULLFSBLOCK;
int nimaps = 1;
if (imap->br_state == XFS_EXT_NORM)