4.15-stable review patch. If anyone has any objections, please let me know.
------------------ From: Leon Romanovsky <[email protected]> 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: <[email protected]> Signed-off-by: Leon Romanovsky <[email protected]> Reviewed-by: Sean Hefty <[email protected]> Signed-off-by: Jason Gunthorpe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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; }
