4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Leon Romanovsky <leo...@mellanox.com> commit ed65a4dc22083e73bac599ded6a262318cad7baf upstream. The error in ucma_create_id() left ctx in the list of contexts belong to ucma file descriptor. The attempt to close this file descriptor causes to use-after-free accesses while iterating over such list. Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace") Reported-by: <syzbot+dcfd344365a56fbeb...@syzkaller.appspotmail.com> Signed-off-by: Leon Romanovsky <leo...@mellanox.com> Reviewed-by: Sean Hefty <sean.he...@intel.com> Signed-off-by: Jason Gunthorpe <j...@mellanox.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/infiniband/core/ucma.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -497,6 +497,9 @@ err1: mutex_lock(&mut); idr_remove(&ctx_idr, ctx->id); mutex_unlock(&mut); + mutex_lock(&file->mut); + list_del(&ctx->list); + mutex_unlock(&file->mut); kfree(ctx); return ret; }