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infiniband: fix race condition between infiniband mlx4, mlx5 driver and core dumping

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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>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ajay Kaher 2019-08-04 09:29:26 +05:30 committed by Greg Kroah-Hartman
parent 16903f1a5b
commit 91c3a6ce3a
2 changed files with 6 additions and 1 deletions
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4
drivers/infiniband/hw/mlx4/main.c
View File

@ -1172,6 +1172,8 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
* mlx4_ib_vma_close().
*/
down_write(&owning_mm->mmap_sem);
if (!mmget_still_valid(owning_mm))
goto skip_mm;
for (i = 0; i < HW_BAR_COUNT; i++) {
vma = context->hw_bar_info[i].vma;
if (!vma)
@ -1190,7 +1192,7 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
/* context going to be destroyed, should not access ops any more */
context->hw_bar_info[i].vma->vm_ops = NULL;
}
skip_mm:
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);

3
drivers/infiniband/hw/mlx5/main.c
View File

@ -1307,6 +1307,8 @@ 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;
list_for_each_entry_safe(vma_private, n, &context->vma_private_list,
list) {
vma = vma_private->vma;
@ -1321,6 +1323,7 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
list_del(&vma_private->list);
kfree(vma_private);
}
skip_mm:
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);