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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2013-10-31 21:00:10 +0300 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2013-12-10 09:59:37 -0600 |
| commit | 31978b5cc66b8ba8a7e8eef60b12395d41b7b890 (patch) | |
| tree | 77d24804c4e53b726d459b79a0b9850fe90c8c52 /fs/xfs/xfs_ioctl32.c | |
| parent | dc1ccc48159d63eca5089e507c82c7d22ef60839 (diff) | |
| download | linux-next-31978b5cc66b8ba8a7e8eef60b12395d41b7b890.tar.gz | |
xfs: underflow bug in xfs_attrlist_by_handle()
If we allocate less than sizeof(struct attrlist) then we end up
corrupting memory or doing a ZERO_PTR_SIZE dereference.
This can only be triggered with CAP_SYS_ADMIN.
Reported-by: Nico Golde <nico@ngolde.de>
Reported-by: Fabian Yamaguchi <fabs@goesec.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
(cherry picked from commit 071c529eb672648ee8ca3f90944bcbcc730b4c06)
Diffstat (limited to 'fs/xfs/xfs_ioctl32.c')
| -rw-r--r-- | fs/xfs/xfs_ioctl32.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c index e8fb1231db81..a7992f8de9d3 100644 --- a/fs/xfs/xfs_ioctl32.c +++ b/fs/xfs/xfs_ioctl32.c @@ -356,7 +356,8 @@ xfs_compat_attrlist_by_handle( if (copy_from_user(&al_hreq, arg, sizeof(compat_xfs_fsop_attrlist_handlereq_t))) return -XFS_ERROR(EFAULT); - if (al_hreq.buflen > XATTR_LIST_MAX) + if (al_hreq.buflen < sizeof(struct attrlist) || + al_hreq.buflen > XATTR_LIST_MAX) return -XFS_ERROR(EINVAL); /* |