path: root/fs/xfs/xfs_fsops.c
diff options
authorEric Sandeen <sandeen@sandeen.net>2009-05-23 14:30:12 -0500
committerFelix Blyakher <felixb@sgi.com>2009-06-01 22:59:38 -0500
commite6da7c9fed111ba1243297ee6eda8e24ae11c384 (patch)
tree7e683f4591bdb349eef6ea6f80517b71965143b8 /fs/xfs/xfs_fsops.c
parent1f23920dbf1377fa9e4aef4f3d20c34a06a71a35 (diff)
xfs: fix overflow in xfs_growfs_data_private
In the case where growing a filesystem would leave the last AG too small, the fixup code has an overflow in the calculation of the new size with one fewer ag, because "nagcount" is a 32 bit number. If the new filesystem has > 2^32 blocks in it this causes a problem resulting in an EINVAL return from growfs: # xfs_io -f -c "truncate 19998630180864" fsfile # mkfs.xfs -f -bsize=4096 -dagsize=76288719b,size=3905982455b fsfile # mount -o loop fsfile /mnt # xfs_growfs /mnt meta-data=/dev/loop0 isize=256 agcount=52, agsize=76288719 blks = sectsz=512 attr=2 data = bsize=4096 blocks=3905982455, imaxpct=5 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=32768, version=2 = sectsz=512 sunit=0 blks, lazy-count=0 realtime =none extsz=4096 blocks=0, rtextents=0 xfs_growfs: XFS_IOC_FSGROWFSDATA xfsctl failed: Invalid argument Reported-by: richard.ems@cape-horn-eng.com Signed-off-by: Eric Sandeen <sandeen@sandeen.net> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Felix Blyakher <felixb@sgi.com> Signed-off-by: Felix Blyakher <felixb@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_fsops.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 8379e3bca26..cbd451bb484 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -160,7 +160,7 @@ xfs_growfs_data_private(
nagcount = new + (nb_mod != 0);
if (nb_mod && nb_mod < XFS_MIN_AG_BLOCKS) {
- nb = nagcount * mp->m_sb.sb_agblocks;
+ nb = (xfs_rfsblock_t)nagcount * mp->m_sb.sb_agblocks;
if (nb < mp->m_sb.sb_dblocks)