diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2025-10-08 15:17:18 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-11-13 15:37:46 -0500 |
| commit | dbf316fc90aa954dcd5440817f4b944627ed63e0 (patch) | |
| tree | 154f9a40eb29c17dd8b1cfba593c76d99f5e7a79 /tools/perf/scripts/python | |
| parent | 3a50d59b3781bc3a4e96533612509546a4c309a7 (diff) | |
iommufd: Don't overflow during division for dirty tracking
commit cb30dfa75d55eced379a42fd67bd5fb7ec38555e upstream.
If pgshift is 63 then BITS_PER_TYPE(*bitmap->bitmap) * pgsize will overflow
to 0 and this triggers divide by 0.
In this case the index should just be 0, so reorganize things to divide
by shift and avoid hitting any overflows.
Link: https://patch.msgid.link/r/0-v1-663679b57226+172-iommufd_dirty_div0_jgg@nvidia.com
Cc: stable@vger.kernel.org
Fixes: 58ccf0190d19 ("vfio: Add an IOVA bitmap support")
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reported-by: syzbot+093a8a8b859472e6c257@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=093a8a8b859472e6c257
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions