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xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write

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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>
This commit is contained in:
Darrick J. Wong 2017-07-17 14:30:51 -07:00
parent 1e86eabe73
commit 4c1a67bd36
2 changed files with 10 additions and 1 deletions
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9
fs/xfs/libxfs/xfs_bmap.c
View file

@ -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),

2
fs/xfs/xfs_reflink.c
View file

@ -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)