xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write
commit 4c1a67bd3606540b9b42caff34a1d5cd94b1cf65 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 29a75ec..350fc64 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -333,7 +333,7 @@
struct xfs_defer_ops *dfops)
{
struct xfs_bmbt_irec irec = *imap;
- xfs_fsblock_t first_block;
+ xfs_fsblock_t first_block = NULLFSBLOCK;
int nimaps = 1;
if (imap->br_state == XFS_EXT_NORM)