diff options
| author | Ajay Kaher <akaher@vmware.com> | 2019-06-10 23:52:17 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-22 09:16:19 +0300 |
| commit | 7ab0cb70c2d2c7615b2b489d55e850cdae5400ef (patch) | |
| tree | 0bf2d0dba739290b45818563bb92c76637ab49d0 /drivers/infiniband/hw/mlx5/main.c | |
| parent | dc30d2ceebe1d51d2d4a1bd3989289b9093505a5 (diff) | |
| download | linux-7ab0cb70c2d2c7615b2b489d55e850cdae5400ef.tar.xz | |
infiniband: fix race condition between infiniband mlx4, mlx5 driver and core dumping
This patch is the extension of following upstream commit to fix
the race condition between get_task_mm() and core dumping
for IB->mlx4 and IB->mlx5 drivers:
commit 04f5866e41fb ("coredump: fix race condition between
mmget_not_zero()/get_task_mm() and core dumping")'
Thanks to Jason for pointing this.
Signed-off-by: Ajay Kaher <akaher@vmware.com>
Acked-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/hw/mlx5/main.c')
| -rw-r--r-- | drivers/infiniband/hw/mlx5/main.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c index 13a92062e9ca..3fbe3962d53b 100644 --- a/drivers/infiniband/hw/mlx5/main.c +++ b/drivers/infiniband/hw/mlx5/main.c @@ -1646,6 +1646,8 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) * mlx5_ib_vma_close. */ down_write(&owning_mm->mmap_sem); + if (!mmget_still_valid(owning_mm)) + goto skip_mm; mutex_lock(&context->vma_private_list_mutex); list_for_each_entry_safe(vma_private, n, &context->vma_private_list, list) { @@ -1662,6 +1664,7 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext) kfree(vma_private); } mutex_unlock(&context->vma_private_list_mutex); +skip_mm: up_write(&owning_mm->mmap_sem); mmput(owning_mm); put_task_struct(owning_process); |