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xfs: do not use unchecked extent indices in xfs_bmap_add_extent_* 

Make sure to only call xfs_iext_get_ext after we've validate the
extent index in the various xfs_bmap_add_extent_* helpers.

Based on an earlier patch from Lachlan McIlroy.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lachlan McIlroy <lmcilroy@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-05-11 15:04:06 +00:00 committed by Alex Elder
parent ec90c55634
commit 2f2b3220b0
1 changed files with 6 additions and 8 deletions
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14
fs/xfs/xfs_bmap.c
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@ -1629,7 +1629,6 @@ xfs_bmap_add_extent_hole_delay(
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp) /* inode logging flags */
{
xfs_bmbt_rec_host_t *ep; /* extent record for idx */
xfs_ifork_t *ifp; /* inode fork pointer */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_filblks_t newlen=0; /* new indirect size */
@ -1639,7 +1638,6 @@ xfs_bmap_add_extent_hole_delay(
xfs_filblks_t temp=0; /* temp for indirect calculations */
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
ep = xfs_iext_get_ext(ifp, *idx);
state = 0;
ASSERT(isnullstartblock(new->br_startblock));
@ -1660,7 +1658,7 @@ xfs_bmap_add_extent_hole_delay(
*/
if (*idx < ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(ep, &right);
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
@ -1740,7 +1738,8 @@ xfs_bmap_add_extent_hole_delay(
oldlen = startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = xfs_bmap_worst_indlen(ip, temp);
xfs_bmbt_set_allf(ep, new->br_startoff,
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
new->br_startoff,
nullstartblock((int)newlen), temp, right.br_state);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);
break;
@ -1780,7 +1779,6 @@ xfs_bmap_add_extent_hole_real(
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
xfs_bmbt_rec_host_t *ep; /* pointer to extent entry ins. point */
int error; /* error return value */
int i; /* temp state */
xfs_ifork_t *ifp; /* inode fork pointer */
@ -1791,7 +1789,6 @@ xfs_bmap_add_extent_hole_real(
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(*idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
ep = xfs_iext_get_ext(ifp, *idx);
state = 0;
if (whichfork == XFS_ATTR_FORK)
@ -1813,7 +1810,7 @@ xfs_bmap_add_extent_hole_real(
*/
if (*idx < ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)) {
state |= BMAP_RIGHT_VALID;
xfs_bmbt_get_all(ep, &right);
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, *idx), &right);
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
@ -1925,7 +1922,8 @@ xfs_bmap_add_extent_hole_real(
* Merge the new allocation with the right neighbor.
*/
trace_xfs_bmap_pre_update(ip, *idx, state, _THIS_IP_);
xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, *idx),
new->br_startoff, new->br_startblock,
new->br_blockcount + right.br_blockcount,
right.br_state);
trace_xfs_bmap_post_update(ip, *idx, state, _THIS_IP_);