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xfs: check that bc_nlevels never overflows 

Warn if we ever bump nlevels higher than the allowed maximum cursor
height.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Chandan Babu R <chandan.babu@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2021-09-16 12:22:08 -07:00
parent 1ba6fd34ca
commit 4c175af2cc
2 changed files with 4 additions and 0 deletions
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2
fs/xfs/libxfs/xfs_btree.c
View File

@ -2933,6 +2933,7 @@ xfs_btree_new_iroot(
be16_add_cpu(&block->bb_level, 1);
xfs_btree_set_numrecs(block, 1);
cur->bc_nlevels++;
ASSERT(cur->bc_nlevels <= XFS_BTREE_MAXLEVELS);
cur->bc_ptrs[level + 1] = 1;
kp = xfs_btree_key_addr(cur, 1, block);
@ -3096,6 +3097,7 @@ xfs_btree_new_root(
xfs_btree_setbuf(cur, cur->bc_nlevels, nbp);
cur->bc_ptrs[cur->bc_nlevels] = nptr;
cur->bc_nlevels++;
ASSERT(cur->bc_nlevels <= XFS_BTREE_MAXLEVELS);
*stat = 1;
return 0;
error0:

2
fs/xfs/libxfs/xfs_btree_staging.c
View File

@ -703,6 +703,7 @@ xfs_btree_bload_compute_geometry(
* block-based btree level.
*/
cur->bc_nlevels++;
ASSERT(cur->bc_nlevels <= XFS_BTREE_MAXLEVELS);
xfs_btree_bload_level_geometry(cur, bbl, level,
nr_this_level, &avg_per_block,
&level_blocks, &dontcare64);
@ -718,6 +719,7 @@ xfs_btree_bload_compute_geometry(
/* Otherwise, we need another level of btree. */
cur->bc_nlevels++;
ASSERT(cur->bc_nlevels <= XFS_BTREE_MAXLEVELS);
}
nr_blocks += level_blocks;