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xfs: check for valid indices in xfs_iext_get_ext and xfs_iext_idx_to_irec 

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 15:04:11 +00:00 committed by Alex Elder
parent ab1908a5bb
commit 87bef1812d
1 changed files with 6 additions and 2 deletions
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8
fs/xfs/xfs_inode.c
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@ -3108,6 +3108,8 @@ xfs_iext_get_ext(
xfs_extnum_t idx) /* index of target extent */
{
ASSERT(idx >= 0);
ASSERT(idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
return ifp->if_u1.if_ext_irec->er_extbuf;
} else if (ifp->if_flags & XFS_IFEXTIREC) {
@ -3881,8 +3883,10 @@ xfs_iext_idx_to_irec(
xfs_extnum_t page_idx = *idxp; /* extent index in target list */
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
ASSERT(page_idx >= 0 && page_idx <=
ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
ASSERT(page_idx >= 0);
ASSERT(page_idx <= ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
ASSERT(page_idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t) || realloc);
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
erp_idx = 0;
low = 0;