git: sys/vfs/msdosfs: Fix a serious off by 1 for cluster bitmap

[Tomohiro Kusumi]

commit 8a835481917cf773453347ad035c70a5aa72126c
Author: Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
Date:   Fri Oct 11 22:52:10 2019 +0900

    sys/vfs/msdosfs: Fix a serious off by 1 for cluster bitmap
    
    from freebsd/freebsd at 4159786890522d187529c336eb6da4029f04a3e1
    
        Fixed a serious off by 1 error.  The cluster-in-use bitmap was overrun
        by 1 u_int if the number of clusters was 1 more than a multiple of
        (8 * sizeof(u_int)).  The bitmap is malloced and large (often huge), so
        fatal overrun probably only occurred if the number of clusters was 1
        more than 1 multiple of PAGE_SIZE/8.

Summary of changes:
 sys/vfs/msdosfs/msdosfs_vfsops.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/8a835481917cf773453347ad035c70a5aa72126c


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