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| author | Douglas Miller <doug.miller@cornelisnetworks.com> | 2022-04-08 16:35:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-13 21:59:23 +0300 |
| commit | 9ca11bd8222a612de0d2f54d050bfcf61ae2883f (patch) | |
| tree | 2732161bcfe12bff3dd8c349ed6a77184a960e96 /include | |
| parent | fa7cc2df95050210e2e61b461686567a4dc91d40 (diff) | |
| download | linux-9ca11bd8222a612de0d2f54d050bfcf61ae2883f.tar.xz | |
RDMA/hfi1: Fix use-after-free bug for mm struct
commit 2bbac98d0930e8161b1957dc0ec99de39ade1b3c upstream.
Under certain conditions, such as MPI_Abort, the hfi1 cleanup code may
represent the last reference held on the task mm.
hfi1_mmu_rb_unregister() then drops the last reference and the mm is freed
before the final use in hfi1_release_user_pages(). A new task may
allocate the mm structure while it is still being used, resulting in
problems. One manifestation is corruption of the mmap_sem counter leading
to a hang in down_write(). Another is corruption of an mm struct that is
in use by another task.
Fixes: 3d2a9d642512 ("IB/hfi1: Ensure correct mm is used at all times")
Link: https://lore.kernel.org/r/20220408133523.122165.72975.stgit@awfm-01.cornelisnetworks.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Douglas Miller <doug.miller@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions