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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>
This commit is contained in:
Peter Watkins 2014-12-04 09:30:51 +11:00 committed by Dave Chinner
parent e77b8547ca
commit 76b5730252
1 changed files with 6 additions and 7 deletions
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13
fs/xfs/xfs_iomap.c
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@ -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;