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authorPeter Watkins <treestem@gmail.com>2014-12-04 09:30:51 +1100
committerDave Chinner <david@fromorbit.com>2014-12-04 09:30:51 +1100
commit76b57302526ae289e8094a51d6a71031ff3d058b (patch)
tree2d265a83e3645a8c1fd5d1b41ce42e750b919c88
parente77b8547ca9c4b87932e9da3db906bc016885d8d (diff)
xfs: overflow in xfs_iomap_eof_align_last_fsb
If extsize is set and new_last_fsb is larger than 32 bits, the roundup to extsize will overflow the align variable. Instead, combine alignments by rounding stripe size up to extsize. Signed-off-by: Peter Watkins <treestem@gmail.com> Reviewed-by: Nathaniel W. Turner <nate@houseofnate.net> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
-rw-r--r--fs/xfs/xfs_iomap.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index afcf3c926565..3fad07136c5d 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -52,7 +52,6 @@ xfs_iomap_eof_align_last_fsb(
xfs_extlen_t extsize,
xfs_fileoff_t *last_fsb)
{
- xfs_fileoff_t new_last_fsb = 0;
xfs_extlen_t align = 0;
int eof, error;
@@ -70,8 +69,8 @@ xfs_iomap_eof_align_last_fsb(
else if (mp->m_dalign)
align = mp->m_dalign;
- if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align))
- new_last_fsb = roundup_64(*last_fsb, align);
+ if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
+ align = 0;
}
/*
@@ -79,14 +78,14 @@ xfs_iomap_eof_align_last_fsb(
* (when file on a real-time subvolume or has di_extsize hint).
*/
if (extsize) {
- if (new_last_fsb)
- align = roundup_64(new_last_fsb, extsize);
+ if (align)
+ align = roundup_64(align, extsize);
else
align = extsize;
- new_last_fsb = roundup_64(*last_fsb, align);
}
- if (new_last_fsb) {
+ if (align) {
+ xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align);
error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
if (error)
return error;