From 0925fecc557471b6f6a488c3590a275151210572 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 12 Jul 2021 12:58:49 -0700 Subject: xfs: fix an integer overflow error in xfs_growfs_rt During a realtime grow operation, we run a single transaction for each rt bitmap block added to the filesystem. This means that each step has to be careful to increase sb_rblocks appropriately. Fix the integer overflow error in this calculation that can happen when the extent size is very large. Found by running growfs to add a rt volume to a filesystem formatted with a 1g rt extent size. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_rtalloc.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'fs') diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c index 8f6a05db4468..699066fb9052 100644 --- a/fs/xfs/xfs_rtalloc.c +++ b/fs/xfs/xfs_rtalloc.c @@ -1021,7 +1021,8 @@ xfs_growfs_rt( ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0); bmbno < nrbmblocks; bmbno++) { - xfs_trans_t *tp; + struct xfs_trans *tp; + xfs_rfsblock_t nrblocks_step; *nmp = *mp; nsbp = &nmp->m_sb; @@ -1030,10 +1031,9 @@ xfs_growfs_rt( */ nsbp->sb_rextsize = in->extsize; nsbp->sb_rbmblocks = bmbno + 1; - nsbp->sb_rblocks = - XFS_RTMIN(nrblocks, - nsbp->sb_rbmblocks * NBBY * - nsbp->sb_blocksize * nsbp->sb_rextsize); + nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize * + nsbp->sb_rextsize; + nsbp->sb_rblocks = min(nrblocks, nrblocks_step); nsbp->sb_rextents = nsbp->sb_rblocks; do_div(nsbp->sb_rextents, nsbp->sb_rextsize); ASSERT(nsbp->sb_rextents != 0); -- cgit v1.2.3