diff options
author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-12-01 10:02:54 +0300 |
---|---|---|
committer | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2020-12-01 16:37:10 +0300 |
commit | 89828f632dec8ab1e19f23771b313c1942e102c0 (patch) | |
tree | 3c647d5302586d77a5c62b7417d46e6fc4955725 /drivers/bus/mhi/core/init.c | |
parent | 10ea8bcda5ae5463889e15dfc98aa2a73270ea58 (diff) | |
download | linux-89828f632dec8ab1e19f23771b313c1942e102c0.tar.xz |
bus: mhi: core: Fix error handling in mhi_register_controller()
There are a few problems with the error handling in this function. They
mostly center around the alloc_ordered_workqueue() allocation.
1) If that allocation fails or if the kcalloc() prior to it fails then
it leads to a NULL dereference when we call
destroy_workqueue(mhi_cntrl->hiprio_wq).
2) The error code is not set.
3) The "mhi_cntrl->mhi_cmd" allocation is not freed.
The error handling was slightly confusing and I re-ordered it to be in
the exact mirror/reverse order of how things were allocated. I changed
the label names to say what the goto does instead of describing where
the goto comes from.
Fixes: 8f7039787687 ("bus: mhi: core: Move to using high priority workqueue")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/bus/mhi/core/init.c')
-rw-r--r-- | drivers/bus/mhi/core/init.c | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index 96cde9c0034c..f0697f433c2f 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -871,7 +871,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, sizeof(*mhi_cntrl->mhi_cmd), GFP_KERNEL); if (!mhi_cntrl->mhi_cmd) { ret = -ENOMEM; - goto error_alloc_cmd; + goto err_free_event; } INIT_LIST_HEAD(&mhi_cntrl->transition_list); @@ -886,7 +886,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, ("mhi_hiprio_wq", WQ_MEM_RECLAIM | WQ_HIGHPRI); if (!mhi_cntrl->hiprio_wq) { dev_err(mhi_cntrl->cntrl_dev, "Failed to allocate workqueue\n"); - goto error_alloc_cmd; + ret = -ENOMEM; + goto err_free_cmd; } mhi_cmd = mhi_cntrl->mhi_cmd; @@ -932,7 +933,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, SOC_HW_VERSION_OFFS, &soc_info); if (ret) - goto error_alloc_dev; + goto err_destroy_wq; mhi_cntrl->family_number = (soc_info & SOC_HW_VERSION_FAM_NUM_BMSK) >> SOC_HW_VERSION_FAM_NUM_SHFT; @@ -946,7 +947,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, mhi_cntrl->index = ida_alloc(&mhi_controller_ida, GFP_KERNEL); if (mhi_cntrl->index < 0) { ret = mhi_cntrl->index; - goto error_ida_alloc; + goto err_destroy_wq; } /* Register controller with MHI bus */ @@ -954,7 +955,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, if (IS_ERR(mhi_dev)) { dev_err(mhi_cntrl->cntrl_dev, "Failed to allocate MHI device\n"); ret = PTR_ERR(mhi_dev); - goto error_alloc_dev; + goto err_ida_free; } mhi_dev->dev_type = MHI_DEVICE_CONTROLLER; @@ -967,7 +968,7 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, ret = device_add(&mhi_dev->dev); if (ret) - goto error_add_dev; + goto err_release_dev; mhi_cntrl->mhi_dev = mhi_dev; @@ -975,19 +976,17 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, return 0; -error_add_dev: +err_release_dev: put_device(&mhi_dev->dev); - -error_alloc_dev: +err_ida_free: ida_free(&mhi_controller_ida, mhi_cntrl->index); - -error_ida_alloc: +err_destroy_wq: + destroy_workqueue(mhi_cntrl->hiprio_wq); +err_free_cmd: kfree(mhi_cntrl->mhi_cmd); - -error_alloc_cmd: - vfree(mhi_cntrl->mhi_chan); +err_free_event: kfree(mhi_cntrl->mhi_event); - destroy_workqueue(mhi_cntrl->hiprio_wq); + vfree(mhi_cntrl->mhi_chan); return ret; } |