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>
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@ -3108,6 +3108,8 @@ xfs_iext_get_ext(
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xfs_extnum_t idx) /* index of target extent */
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{
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ASSERT(idx >= 0);
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ASSERT(idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
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if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
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return ifp->if_u1.if_ext_irec->er_extbuf;
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} else if (ifp->if_flags & XFS_IFEXTIREC) {
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@ -3881,8 +3883,10 @@ xfs_iext_idx_to_irec(
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xfs_extnum_t page_idx = *idxp; /* extent index in target list */
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ASSERT(ifp->if_flags & XFS_IFEXTIREC);
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ASSERT(page_idx >= 0 && page_idx <=
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ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
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ASSERT(page_idx >= 0);
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ASSERT(page_idx <= ifp->if_bytes / sizeof(xfs_bmbt_rec_t));
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ASSERT(page_idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t) || realloc);
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nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
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erp_idx = 0;
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low = 0;
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