From a4656391b76ed93faed724c5963f033164ee477e Mon Sep 17 00:00:00 2001 From: Nathan Scott Date: Fri, 25 Nov 2005 16:41:57 +1100 Subject: [PATCH] [XFS] Fix a 32 bit value wraparound when providing a mapping for a large direct write. SGI-PV: 944820 SGI-Modid: xfs-linux-melb:xfs-kern:24351a Signed-off-by: Nathan Scott --- fs/xfs/linux-2.6/xfs_aops.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c index c6108971b4e..94d3cdfbf9b 100644 --- a/fs/xfs/linux-2.6/xfs_aops.c +++ b/fs/xfs/linux-2.6/xfs_aops.c @@ -941,13 +941,12 @@ __linvfs_get_block( int retpbbm = 1; int error; - if (blocks) { - offset = blocks << inode->i_blkbits; /* 64 bit goodness */ - size = (ssize_t) min_t(xfs_off_t, offset, LONG_MAX); - } else { - size = 1 << inode->i_blkbits; - } offset = (xfs_off_t)iblock << inode->i_blkbits; + if (blocks) + size = (ssize_t) min_t(xfs_off_t, LONG_MAX, + (xfs_off_t)blocks << inode->i_blkbits); + else + size = 1 << inode->i_blkbits; VOP_BMAP(vp, offset, size, create ? flags : BMAPI_READ, &iomap, &retpbbm, error); @@ -1007,7 +1006,7 @@ __linvfs_get_block( ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0); offset = min_t(xfs_off_t, iomap.iomap_bsize - iomap.iomap_delta, - blocks << inode->i_blkbits); + (xfs_off_t)blocks << inode->i_blkbits); bh_result->b_size = (u32) min_t(xfs_off_t, UINT_MAX, offset); } -- 2.41.1