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| author | Jason Gunthorpe <jgg@nvidia.com> | 2025-10-08 15:17:18 -0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2025-10-20 19:58:37 -0300 |
| commit | cb30dfa75d55eced379a42fd67bd5fb7ec38555e (patch) | |
| tree | 9ade4052f6c06adce026341e2ca908cf9f8e5843 /drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | |
| parent | Linux 6.18-rc2 (diff) | |
| download | linux-cb30dfa75d55eced379a42fd67bd5fb7ec38555e.tar.gz linux-cb30dfa75d55eced379a42fd67bd5fb7ec38555e.zip | |
iommufd: Don't overflow during division for dirty tracking
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_device.c')
0 files changed, 0 insertions, 0 deletions