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| author |   Douglas Miller <doug.miller@cornelisnetworks.com> | 2022-04-08 09:35:23 -0400 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@nvidia.com> | 2022-04-08 15:40:06 -0300 |
| commit | 2bbac98d0930e8161b1957dc0ec99de39ade1b3c (patch) | |
| tree | 55c9b2381d8313681ee4d9d1492a2fd3b8776230 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | IB/rdmavt: add lock to call to rvt_error_qp to prevent a race condition (diff) | |
| download | wireguard-linux-2bbac98d0930e8161b1957dc0ec99de39ade1b3c.tar.xz wireguard-linux-2bbac98d0930e8161b1957dc0ec99de39ade1b3c.zip | |
RDMA/hfi1: Fix use-after-free bug for mm struct
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>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions