On Tue, Jun 29, 2021 at 09:49:33AM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@xxxxxxxxxx>
>
> Change location of rdma_restrack_del() to fix the bug where
> task_struct was acquired but not released, causing to resource leak.
>
> ucma_create_id() {
> ucma_alloc_ctx();
> rdma_create_user_id() {
> rdma_restrack_new();
> rdma_restrack_set_name() {
> rdma_restrack_attach_task.part.0(); <--- task_struct was gotten
> }
> }
> ucma_destroy_private_ctx() {
> ucma_put_ctx();
> rdma_destroy_id() {
> _destroy_id() <--- id_priv was freed
> }
> }
> }
>
> Fixes: 889d916b6f8a ("RDMA/core: Don't access cm_id after its destruction")
> Reported-by: Pavel Skripkin <paskripkin@xxxxxxxxx>
> Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
> ---
> ---
> Changelog:
> v3:
> * Dropped controversial hunks and updated commit message respectively
> v2: https://lore.kernel.org/lkml/e2eed941f912b2068e371fd37f43b8cf5082a0e6.1623129597.git.leonro@xxxxxxxxxx
> * Added bug report analysis
> v1: https://lore.kernel.org/linux-rdma/f72e27d5c82cd9beec7670141afa62786836c569.1622956637.git.leonro@xxxxxxxxxx/T/#u
> ---
> drivers/infiniband/core/cma.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied to for-next, thanks
Jason
